Localize version 0.41.0

[0.41.0] — June 3rd, 2026

Breaking Changes

• Localize.Number.Format.Compiler now rejects scientific patterns that contain a grouping separator (e.g. "#,##0.###E0") at compile time. TR35 forbids grouping in scientific patterns; the comma was previously silently ignored at output time. Fix: drop the comma, or use a non-scientific pattern.

Enhancements

• TR35 engineering notation. Patterns like "##0.#####E0" now correctly shift the mantissa so the exponent is a multiple of the pattern's max integer-digit count: 12345 → "12.345E3", 123456 → "123.456E3". Fixed-width mantissa patterns ("00.###E0") similarly shift to expose min_integer_digits integer digits. The shift is exact for Decimal (via the %Decimal{exp: …} field) and lossless for Decimal-promoted floats/integers.

• New :engineering format atom resolving to "##0.######E0". CLDR ships no engineering pattern, so this is a Localize-supplied default — pass an explicit pattern string for different mantissa precision.

• Scientific-pattern emission now reads options.symbols.exponential, options.symbols.minus_sign, and options.symbols.plus_sign from the locale's CLDR data instead of hardcoding ASCII "E", "+", "-". ar/arab renders "أس" with Arabic Letter Mark signs, fa/arabext renders the "×۱۰^" superscripting form, ar/latn wraps signs with U+200E LRM.

• Localize.Number.Format.Compiler now normalises @-significant scientific patterns per TR35: "@@###E0" ≡ "0.0###E0", "@@@##E0" ≡ "0.00##E0", etc. The compiler rewrites these to the canonical 0-prefixed form so the runtime formatter does not need a separate @-aware path.

• New :exponent_style option on Localize.Number.to_string/2. :e (the default) emits the standard 1.234E3 form; :superscript emits 1.234 × 10³ using CLDR's superscriptingExponent symbol and Unicode superscript digits (⁰¹²³⁴⁵⁶⁷⁸⁹⁻⁺). Ignored for non-scientific patterns.

Bug Fixes

• Localize.Utils.Math.round_significant/2 no longer crashes when called with a Decimal and n <= 0 or with a Decimal zero of any sign. Previously these reached :math.log10/1 deep in the Decimal square-root path and raised :invalid_operation; both cases now return the input unchanged.

• Localize.Number.Format.Compiler.compile/1 propagates compile-time errors from format_to_metadata/1 instead of crashing with MatchError.