Additional property to allow inline functions will be nice (was removed from version 3.0.3)

[VasylHulpak]

double(x) = x * 2;
dd(a, b) = a + b;

double(5) + add(2, 3)

Expected Behavior

• Functions can be defined using a lightweight syntax (e.g. fn name(params) = expression)
• Functions are scoped locally to the expression
• Functions can be reused within the same expression
• No global state pollution unless explicitly allowed
• Backward compatible with existing expressions

🧪 Use Cases

• Dynamic computed fields in UI grids
• Configuration-driven formula systems
• Data transformation pipelines
• Business rule engines
• Reducing duplication in expression-heavy systems

🔄 Alternatives Considered

• External function registry (already supported but not inline)
• Preprocessing expressions before evaluation
• Migrating to AST-based engines such as mathjs
• Wrapping expressions in custom evaluation layers

⚠️ Migration / Compatibility Notes

• Feature should be opt-in (e.g. allowInlineFunctions: true)
• Existing expressions must continue working without changes
• Invalid inline function syntax should fail gracefully when disabled