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SimonCroppSimonCropp
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Add Encoder.Convert(ReadOnlySpan<char>, Span<byte>) polyfill (#564)
Polyfills the span-based Encoder.Convert overload (introduced in netcoreapp2.1/netstandard2.1) for older targets, with unsafe pointer and safe array-based variants. The safe fallback matches BCL semantics exactly rather than using StringStream's input cap, since a general consumer expects exact charsUsed parity. Qualify the unqualified Convert.* calls in Base64Polyfill and EnumPolyfill to System.Convert.* to avoid collision with the new Polyfill.Convert extension method.
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Lines changed: 582 additions & 165 deletions

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‎apiCount.include.md‎

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**API count: 1020**
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**API count: 1021**
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### Per Target Framework
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| Target | APIs |
66
| -- | -- |
7-
| `net461` | 967 |
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| `net462` | 967 |
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| `net47` | 966 |
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| `net471` | 965 |
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| `net472` | 961 |
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| `net48` | 961 |
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| `net481` | 961 |
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| `netstandard2.0` | 963 |
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| `net461` | 968 |
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| `net462` | 968 |
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| `net47` | 967 |
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| `net471` | 966 |
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| `net472` | 962 |
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| `net48` | 962 |
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| `net481` | 962 |
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| `netstandard2.0` | 964 |
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| `netstandard2.1` | 815 |
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| `netcoreapp2.0` | 884 |
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| `netcoreapp2.0` | 885 |
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| `netcoreapp2.1` | 826 |
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| `netcoreapp2.2` | 826 |
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| `netcoreapp3.0` | 773 |
@@ -25,4 +25,4 @@
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| `net9.0` | 183 |
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| `net10.0` | 130 |
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| `net11.0` | 62 |
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| `uap10.0` | 953 |
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| `uap10.0` | 954 |

‎api_list.include.md‎

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* `bool TryParse(string?, IFormatProvider?, double)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.double.tryparse?view=net-11.0#system-double-tryparse(system-string-system-iformatprovider-system-double@))
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#### Encoder
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* `void Convert(ReadOnlySpan<char>, Span<byte>, bool, int, int, bool)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.text.encoder.convert?view=net-11.0#system-text-encoder-convert(system-readonlyspan((system-char))-system-span((system-byte))-system-boolean-system-int32@-system-int32@-system-boolean@))
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#### Encoding
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* `int GetByteCount(ReadOnlySpan<char>)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.text.encoding.getbytecount?view=net-11.0#system-text-encoding-getbytecount(system-readonlyspan((system-char))))

‎assemblySize.include.md‎

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| | Empty Assembly | With Polyfill | Diff | Ensure | ArgumentExceptions | StringInterpolation | Nullability |
44
|----------------|----------------|---------------|-----------|-----------|--------------------|---------------------|-------------|
5-
| netstandard2.0 | 8.0KB | 351.5KB | +343.5KB | +9.0KB | +6.5KB | +9.0KB | +13.5KB |
5+
| netstandard2.0 | 8.0KB | 351.5KB | +343.5KB | +9.5KB | +6.5KB | +9.5KB | +14.0KB |
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| netstandard2.1 | 8.5KB | 306.0KB | +297.5KB | +8.5KB | +6.0KB | +9.0KB | +13.5KB |
7-
| net461 | 8.5KB | 350.0KB | +341.5KB | +9.0KB | +6.5KB | +9.5KB | +14.0KB |
8-
| net462 | 7.0KB | 353.5KB | +346.5KB | +9.0KB | +6.5KB | +9.5KB | +13.5KB |
9-
| net47 | 7.0KB | 353.5KB | +346.5KB | +9.0KB | +6.5KB | +9.0KB | +13.5KB |
10-
| net471 | 8.5KB | 352.5KB | +344.0KB | +9.0KB | +6.5KB | +9.5KB | +14.0KB |
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| net472 | 8.5KB | 351.5KB | +343.0KB | +9.0KB | +6.0KB | +9.0KB | +13.5KB |
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| net48 | 8.5KB | 351.5KB | +343.0KB | +9.0KB | +6.0KB | +9.0KB | +13.5KB |
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| net481 | 8.5KB | 351.5KB | +343.0KB | +9.0KB | +6.0KB | +9.0KB | +13.5KB |
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| net461 | 8.5KB | 350.5KB | +342.0KB | +9.0KB | +6.0KB | +9.0KB | +13.5KB |
8+
| net462 | 7.0KB | 354.0KB | +347.0KB | +9.0KB | +6.5KB | +9.0KB | +13.5KB |
9+
| net47 | 7.0KB | 353.5KB | +346.5KB | +9.0KB | +6.5KB | +9.5KB | +13.5KB |
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| net471 | 8.5KB | 353.0KB | +344.5KB | +9.0KB | +6.0KB | +9.0KB | +13.5KB |
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| net472 | 8.5KB | 351.5KB | +343.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
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| net48 | 8.5KB | 351.5KB | +343.0KB | +9.0KB | +6.5KB | +9.0KB | +13.5KB |
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| net481 | 8.5KB | 351.5KB | +343.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
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| netcoreapp2.0 | 9.0KB | 327.5KB | +318.5KB | +9.0KB | +6.5KB | +9.0KB | +13.5KB |
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| netcoreapp2.1 | 9.0KB | 308.0KB | +299.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
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| netcoreapp2.2 | 9.0KB | 308.0KB | +299.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
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| | Empty Assembly | With Polyfill | Diff | Ensure | ArgumentExceptions | StringInterpolation | Nullability |
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|----------------|----------------|---------------|-----------|-----------|--------------------|---------------------|-------------|
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| netstandard2.0 | 8.0KB | 513.0KB | +505.0KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
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| netstandard2.0 | 8.0KB | 513.4KB | +505.4KB | +17.2KB | +8.2KB | +14.4KB | +19.4KB |
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| netstandard2.1 | 8.5KB | 441.7KB | +433.2KB | +16.2KB | +7.7KB | +13.9KB | +18.9KB |
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| net461 | 8.5KB | 512.5KB | +504.0KB | +16.7KB | +8.2KB | +14.4KB | +19.4KB |
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| net462 | 7.0KB | 516.0KB | +509.0KB | +16.7KB | +8.2KB | +14.4KB | +18.9KB |
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| net47 | 7.0KB | 515.8KB | +508.8KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
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| net471 | 8.5KB | 514.4KB | +505.9KB | +16.7KB | +8.2KB | +14.4KB | +19.4KB |
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| net472 | 8.5KB | 512.4KB | +503.9KB | +16.7KB | +7.7KB | +13.9KB | +18.9KB |
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| net48 | 8.5KB | 512.4KB | +503.9KB | +16.7KB | +7.7KB | +13.9KB | +18.9KB |
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| net481 | 8.5KB | 512.4KB | +503.9KB | +16.7KB | +7.7KB | +13.9KB | +18.9KB |
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| netcoreapp2.0 | 9.0KB | 478.4KB | +469.4KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
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| net461 | 8.5KB | 513.5KB | +505.0KB | +16.7KB | +7.7KB | +13.9KB | +18.9KB |
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| net462 | 7.0KB | 517.0KB | +510.0KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
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| net47 | 7.0KB | 516.2KB | +509.2KB | +16.7KB | +8.2KB | +14.4KB | +18.9KB |
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| net471 | 8.5KB | 515.4KB | +506.9KB | +16.7KB | +7.7KB | +13.9KB | +18.9KB |
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| net472 | 8.5KB | 512.8KB | +504.3KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
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| net48 | 8.5KB | 512.8KB | +504.3KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
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| net481 | 8.5KB | 512.8KB | +504.3KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
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| netcoreapp2.0 | 9.0KB | 478.9KB | +469.9KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
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| netcoreapp2.1 | 9.0KB | 447.4KB | +438.4KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
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| netcoreapp2.2 | 9.0KB | 447.4KB | +438.4KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
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| netcoreapp3.0 | 9.5KB | 431.6KB | +422.1KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |

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