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Merge pull request mruby#6744 from mruby/fix/case-in-no-match-error
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‎doc/README.md‎

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New to mruby? Start here:
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| Document | Description |
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| -------- | ----------- |
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| Document | Description |
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| -------------------------------------------- | -------------------------------------- |
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| [Getting Started](guides/getting-started.md) | Build mruby and run your first program |
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| [Language Features](guides/language.md) | Ruby subset supported by mruby |
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| [Limitations](limitations.md) | Behavioral differences from CRuby |
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| [Language Features](guides/language.md) | Ruby subset supported by mruby |
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| [Limitations](limitations.md) | Behavioral differences from CRuby |
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## Guides (for embedders and gem authors)
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### Embedding mruby in C
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| Document | Description |
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| -------- | ----------- |
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| [C API Reference](guides/capi.md) | Values, classes, methods, error handling, fibers |
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| [GC Arena](guides/gc-arena-howto.md) | Managing temporary objects in C extensions |
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| [Linking](guides/link.md) | Linking with `libmruby` |
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| [Amalgamation](guides/amalgamation.md) | Single-file build for easy integration |
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| [Precompiled Symbols](guides/symbol.md) | Compile-time symbol allocation |
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| Document | Description |
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| --------------------------------------- | ------------------------------------------------ |
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| [C API Reference](guides/capi.md) | Values, classes, methods, error handling, fibers |
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| [GC Arena](guides/gc-arena-howto.md) | Managing temporary objects in C extensions |
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| [Linking](guides/link.md) | Linking with `libmruby` |
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| [Amalgamation](guides/amalgamation.md) | Single-file build for easy integration |
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| [Precompiled Symbols](guides/symbol.md) | Compile-time symbol allocation |
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### Building and Configuring
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| Document | Description |
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| -------- | ----------- |
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| [Compilation](guides/compile.md) | Build system, cross-compilation, toolchains |
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| [Build Configuration](guides/mrbconf.md) | Compile-time macros (`MRB_*` flags) |
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| [mrbgems](guides/mrbgems.md) | Creating and managing gems |
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| [Memory](guides/memory.md) | Allocator customization and heap regions |
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| Document | Description |
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| ---------------------------------------- | ------------------------------------------- |
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| [Compilation](guides/compile.md) | Build system, cross-compilation, toolchains |
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| [Build Configuration](guides/mrbconf.md) | Compile-time macros (`MRB_*` flags) |
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| [mrbgems](guides/mrbgems.md) | Creating and managing gems |
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| [Memory](guides/memory.md) | Allocator customization and heap regions |
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### Tools
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| Document | Description |
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| -------- | ----------- |
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| [Debugger](guides/debugger.md) | Using `mrdb` for debugging |
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| Document | Description |
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| ----------------------------------------------- | ----------------------------------------------- |
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| [Debugger](guides/debugger.md) | Using `mrdb` for debugging |
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| [ROM Method Tables](guides/rom-method-table.md) | Read-only method tables for constrained devices |
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### Reference
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| Document | Description |
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| -------- | ----------- |
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| Document | Description |
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| ------------------------------------- | ------------------ |
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| [Directory Structure](guides/hier.md) | Source tree layout |
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## Internals (for mruby contributors)
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Start with [Architecture](internal/architecture.md) for an overview,
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then dive into the subsystem you need:
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| Document | Description |
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| -------- | ----------- |
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| [Architecture](internal/architecture.md) | Overview of object model, VM, GC, compiler |
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| [Virtual Machine](internal/vm.md) | Dispatch loop, call frames, method lookup, fibers |
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| [Garbage Collector](internal/gc.md) | Tri-color marking, write barriers, generational GC |
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| [Compiler Pipeline](internal/compiler.md) | Parser, code generator, IRep, binary format |
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| [Opcodes](internal/opcode.md) | VM instruction set reference |
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| [Value Boxing](internal/boxing.md) | How `mrb_value` encodes types |
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| Document | Description |
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| ----------------------------------------- | -------------------------------------------------- |
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| [Architecture](internal/architecture.md) | Overview of object model, VM, GC, compiler |
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| [Virtual Machine](internal/vm.md) | Dispatch loop, call frames, method lookup, fibers |
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| [Garbage Collector](internal/gc.md) | Tri-color marking, write barriers, generational GC |
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| [Compiler Pipeline](internal/compiler.md) | Parser, code generator, IRep, binary format |
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| [Opcodes](internal/opcode.md) | VM instruction set reference |
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| [Value Boxing](internal/boxing.md) | How `mrb_value` encodes types |
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## Release Notes
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‎doc/guides/language.md‎

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### Integer
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| Configuration | Range |
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| ------------- | ----- |
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| Configuration | Range |
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| -------------------------------------- | ---------------- |
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| 64-bit word boxing (default on 64-bit) | roughly +/- 2^62 |
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| 32-bit word boxing (default on 32-bit) | roughly +/- 2^30 |
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| NaN boxing (64-bit only) | -2^31 to 2^31-1 |
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| NaN boxing (64-bit only) | -2^31 to 2^31-1 |
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Integer overflow raises a `RangeError` unless the `mruby-bigint` gem
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is included, in which case integers automatically promote to
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These classes are always available in mruby (no gem required):
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| Class | Notes |
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| ----- | ----- |
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| Object | Base class for all objects |
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| Module | Module definition and mixin |
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| Class | Class definition and instantiation |
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| NilClass | Singleton `nil` |
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| TrueClass | Singleton `true` |
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| FalseClass | Singleton `false` |
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| Integer | Fixed-precision integer |
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| Float | Floating-point (unless `MRB_NO_FLOAT`) |
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| Symbol | Interned identifier |
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| String | Mutable byte string |
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| Array | Ordered collection |
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| Hash | Key-value mapping |
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| Range | Interval representation |
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| Proc | Closure / callable object |
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| Exception | Exception hierarchy root |
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| StandardError | Common error base |
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| Class | Notes |
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| ------------- | -------------------------------------- |
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| Object | Base class for all objects |
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| Module | Module definition and mixin |
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| Class | Class definition and instantiation |
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| NilClass | Singleton `nil` |
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| TrueClass | Singleton `true` |
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| FalseClass | Singleton `false` |
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| Integer | Fixed-precision integer |
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| Float | Floating-point (unless `MRB_NO_FLOAT`) |
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| Symbol | Interned identifier |
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| String | Mutable byte string |
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| Array | Ordered collection |
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| Hash | Key-value mapping |
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| Range | Interval representation |
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| Proc | Closure / callable object |
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| Exception | Exception hierarchy root |
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| StandardError | Common error base |
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### Core Modules
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| Module | Notes |
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| ------ | ----- |
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| Kernel | Core methods (`puts`, `p`, `raise`, etc.) |
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| Comparable | Comparison operators via `<=>` |
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| Enumerable | Collection iteration methods |
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| Module | Notes |
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| ---------- | ----------------------------------------- |
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| Kernel | Core methods (`puts`, `p`, `raise`, etc.) |
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| Comparable | Comparison operators via `<=>` |
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| Enumerable | Collection iteration methods |
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## Standard Library (via gemboxes)
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### Classes and Modules
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| Class/Module | Gembox | Gem |
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| ------------ | ------ | --- |
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| Fiber | stdlib | mruby-fiber |
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| Enumerator | stdlib | mruby-enumerator |
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| Enumerator::Lazy | stdlib | mruby-enum-lazy |
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| Set | stdlib | mruby-set |
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| ObjectSpace | stdlib | mruby-objectspace |
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| Time | stdlib-ext | mruby-time |
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| Struct | stdlib-ext | mruby-struct |
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| Data | stdlib-ext | mruby-data |
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| Random | stdlib-ext | mruby-random |
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| IO, File | stdlib-io | mruby-io |
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| Socket | stdlib-io | mruby-socket |
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| Dir | stdlib-io | mruby-dir |
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| Errno | stdlib-io | mruby-errno |
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| Math | math | mruby-math |
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| Rational | math | mruby-rational |
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| Complex | math | mruby-complex |
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| Bigint | math | mruby-bigint |
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| Method, UnboundMethod | metaprog | mruby-method |
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| Class/Module | Gembox | Gem |
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| --------------------- | ---------- | ----------------- |
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| Fiber | stdlib | mruby-fiber |
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| Enumerator | stdlib | mruby-enumerator |
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| Enumerator::Lazy | stdlib | mruby-enum-lazy |
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| Set | stdlib | mruby-set |
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| ObjectSpace | stdlib | mruby-objectspace |
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| Time | stdlib-ext | mruby-time |
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| Struct | stdlib-ext | mruby-struct |
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| Data | stdlib-ext | mruby-data |
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| Random | stdlib-ext | mruby-random |
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| IO, File | stdlib-io | mruby-io |
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| Socket | stdlib-io | mruby-socket |
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| Dir | stdlib-io | mruby-dir |
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| Errno | stdlib-io | mruby-errno |
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| Math | math | mruby-math |
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| Rational | math | mruby-rational |
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| Complex | math | mruby-complex |
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| Bigint | math | mruby-bigint |
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| Method, UnboundMethod | metaprog | mruby-method |
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### Methods and Features
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| Feature | Gembox | Gem |
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| ------- | ------ | --- |
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| `catch`/`throw` | stdlib | mruby-catch |
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| `Kernel#sprintf`, `String#%` | stdlib-ext | mruby-sprintf |
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| `Array#pack`, `String#unpack` | stdlib-ext | mruby-pack |
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| `Kernel#rand` | stdlib-ext | mruby-random |
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| `Kernel#eval` | metaprog | mruby-eval |
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| `Kernel#binding` | metaprog | mruby-binding |
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| `Proc#binding` | metaprog | mruby-proc-binding |
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| Runtime compiler | metaprog | mruby-compiler |
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| Feature | Gembox | Gem |
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| ----------------------------- | ---------- | ------------------ |
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| `catch`/`throw` | stdlib | mruby-catch |
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| `Kernel#sprintf`, `String#%` | stdlib-ext | mruby-sprintf |
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| `Array#pack`, `String#unpack` | stdlib-ext | mruby-pack |
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| `Kernel#rand` | stdlib-ext | mruby-random |
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| `Kernel#eval` | metaprog | mruby-eval |
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| `Kernel#binding` | metaprog | mruby-binding |
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| `Proc#binding` | metaprog | mruby-proc-binding |
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| Runtime compiler | metaprog | mruby-compiler |
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### Core Class Extensions
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The `stdlib` gembox also extends built-in classes with additional
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| Extension | Examples |
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| --------- | -------- |
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| Array extensions | `#dig`, `#union`, `#difference` |
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| Hash extensions | `#dig`, `#transform_keys`, `#transform_values` |
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| String extensions | `#encode`, `#bytes`, `#chars` |
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| Numeric extensions | `Integer#digits`, `Integer#pow` |
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| Comparable extensions | `#clamp` |
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| Enumerable extensions | `#sort_by`, `#min_by`, `#max_by`, `#tally` |
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| Range extensions | `#size`, `#cover?` |
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| Proc extensions | `#<<`, `#>>` (composition) |
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| Symbol extensions | `#to_proc` |
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| Object extensions | `#then`, `#yield_self` |
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| Kernel extensions | `#__method__` |
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| Class/Module extensions | `Module#name` |
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| Extension | Examples |
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| ----------------------- | ---------------------------------------------- |
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| Array extensions | `#dig`, `#union`, `#difference` |
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| Hash extensions | `#dig`, `#transform_keys`, `#transform_values` |
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| String extensions | `#encode`, `#bytes`, `#chars` |
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| Numeric extensions | `Integer#digits`, `Integer#pow` |
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| Comparable extensions | `#clamp` |
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| Enumerable extensions | `#sort_by`, `#min_by`, `#max_by`, `#tally` |
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| Range extensions | `#size`, `#cover?` |
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| Proc extensions | `#<<`, `#>>` (composition) |
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| Symbol extensions | `#to_proc` |
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| Object extensions | `#then`, `#yield_self` |
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| Kernel extensions | `#__method__` |
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| Class/Module extensions | `Module#name` |
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### Gembox Summary
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| Gembox | Contents | Notes |
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| ------ | -------- | ----- |
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| `stdlib` | Core class extensions, Fiber, Enumerator, Set | Works with `MRB_NO_STDIO` and `MRB_NO_FLOAT` |
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| `stdlib-ext` | Time, Struct, Data, Random, sprintf, pack | Works with `MRB_NO_STDIO` and `MRB_NO_FLOAT` |
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| `stdlib-io` | IO, File, Dir, Socket, Errno | Requires stdio |
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| `math` | Math, Rational, Complex, Bigint | Works with `MRB_NO_STDIO` |
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| `metaprog` | eval, binding, Method, compiler | Works with `MRB_NO_STDIO` and `MRB_NO_FLOAT` |
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| `default` | All of the above + CLI tools | Full installation |
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| Gembox | Contents | Notes |
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| ------------ | --------------------------------------------- | -------------------------------------------- |
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| `stdlib` | Core class extensions, Fiber, Enumerator, Set | Works with `MRB_NO_STDIO` and `MRB_NO_FLOAT` |
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| `stdlib-ext` | Time, Struct, Data, Random, sprintf, pack | Works with `MRB_NO_STDIO` and `MRB_NO_FLOAT` |
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| `stdlib-io` | IO, File, Dir, Socket, Errno | Requires stdio |
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| `math` | Math, Rational, Complex, Bigint | Works with `MRB_NO_STDIO` |
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| `metaprog` | eval, binding, Method, compiler | Works with `MRB_NO_STDIO` and `MRB_NO_FLOAT` |
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| `default` | All of the above + CLI tools | Full installation |
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## Key Differences from CRuby
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Key compile-time macros that affect language behavior:
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| Macro | Effect |
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| ----- | ------ |
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| `MRB_NO_FLOAT` | Remove all float support |
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| `MRB_USE_FLOAT32` | Use 32-bit float instead of double |
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| `MRB_UTF8_STRING` | Enable UTF-8 string handling |
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| `MRB_INT32` | Force 32-bit integer |
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| `MRB_INT64` | Force 64-bit integer |
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| `MRB_STR_LENGTH_MAX` | Max string length (default 1MB) |
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| `MRB_ARY_LENGTH_MAX` | Max array length (default 2^17) |
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| Macro | Effect |
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| -------------------- | ---------------------------------- |
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| `MRB_NO_FLOAT` | Remove all float support |
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| `MRB_USE_FLOAT32` | Use 32-bit float instead of double |
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| `MRB_UTF8_STRING` | Enable UTF-8 string handling |
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| `MRB_INT32` | Force 32-bit integer |
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| `MRB_INT64` | Force 64-bit integer |
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| `MRB_STR_LENGTH_MAX` | Max string length (default 1MB) |
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| `MRB_ARY_LENGTH_MAX` | Max array length (default 2^17) |
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See [mrbconf.md](mrbconf.md) for the complete list of configuration
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macros.

‎doc/guides/memory.md‎

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The page size is controlled by `MRB_HEAP_PAGE_SIZE` (default: 1024 slots).
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Each page occupies:
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| Platform | Slot size | Page size (approx) |
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|----------|-----------|---------------------|
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| 64-bit | 40 bytes | ~41 KB |
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| 32-bit | 24 bytes | ~25 KB |
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| Platform | Slot size | Page size (approx) |
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| -------- | --------- | ------------------ |
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| 64-bit | 40 bytes | ~41 KB |
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| 32-bit | 24 bytes | ~25 KB |
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To estimate pages for a given buffer: `pages = buffer_size / sizeof(mrb_heap_page)`.
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Each page provides `MRB_HEAP_PAGE_SIZE` object slots.

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