Localize version 0.42.0

[0.42.0] — July 4th, 2026

Changed

• Compact decimal/currency formats (:decimal_short, :decimal_long, :currency_short) now apply the ECMA-402/ICU default precision of at most two significant digits on the mantissa: 1234 renders "1.2K" (previously "1K"). Pass :fractional_digits or :max_fractional_digits to override.

• The json_polyfill dependency is no longer declared conditionally at publish time. On OTP 26, add {:json_polyfill, "~> 0.2 or ~> 1.0"} to your own dependencies; the supervisor raises at application start with instructions if the :json module is missing.

Fixed

• Compact-format plural selection now uses the mantissa as displayed, per TR35, fixing grammatically impossible output such as es "1 millones" for 1,050,000. Exact-match count="1" compact patterns (fr 1000 → "mille") are now selected, matching ICU.

• Plural rules for compact values {mantissa, exponent} now compute the n/i/v/w/f/t operands after shifting by the exponent per the TR35 operand table, and Decimals with positive exponents (1e6) no longer report phantom visible fraction digits.

• BCE years render era-relative for Calendar.ISO dates: ISO year -1 formats as "2 BC", year 0 as "1 BC" (previously "-1 BC"/"0 BC").

• Significant-digit rounding no longer forces a trailing fraction digit when the rounded value is integral: 1234.567 at 3 significant digits renders "1,230" (previously "1,230.0"), and minimum significant digits now pad trailing zeros ("1.00" at min 3).

• A corrupt or truncated locale cache file is treated as a cache miss/stale instead of raising, and cache writes are atomic (write-temp-then-rename) so a crash mid-write can no longer tear a cache file.

• Locale downloads no longer follow HTTP redirects — the CDN URL is fully known, so a redirect is always refused.

• An unknown :usage option to Localize.Unit.Preference.preferred_units/2 no longer creates atoms from user input; it falls back to :default preferences per TR35.

Added

• The hex package now includes the NIF sources (c_src/), so LOCALIZE_NIF=true builds from the published package.