Unicode String version 2.4.1

Deprecations

• Unicode.String.Break.Grapheme, …Word, …Sentence and …Line are deprecated and will be removed in 2.5.0. They have delegated to Unicode.String.Dfa.* since 2.4.0 and each function now names 2.5.0 in the warning it emits; the arities match, so migrating is a module rename.

Performance

• Resolve uncontextual case mappings from a lookup table rather than one generated function clause each, which takes casing/6 from 4,776 clauses to 37 and a clean compile from 47 seconds to 4.4. Non-ASCII case conversion is roughly 1.4x slower in exchange; ASCII and the locale-specific rules are unchanged.

• Compile the regular expressions that locale-specific casing tests its context with, rather than interpolating them into a sigil at the point of use. An interpolated sigil is not a literal so it recompiled a pattern of roughly 9KB on every character it examined: Greek lower casing is 49x faster, Turkish 46x, and Greek upper casing 11x.