v0.4.0

• Badges (stable version, downloads, build, static analysis, Psalm level,
  PHP, license) and a package description in the sibling packages' style.
• string() rejects invalid UTF-8 up-front, before any length, format or
  pattern check — the domain is JSON strings, so the code-point length and
  the pattern engine never disagree about the input (#12).
• A PCRE engine failure during a pattern check (e.g. backtrack limit
  exhausted) is reported as its own error — Pattern check failed (PCRE engine error: …) — never as a plain pattern mismatch (#11).
• BC: SchemaException now extends \InvalidArgumentException
  (invalid input, semantically) instead of \RuntimeException. Code
  catching it as \RuntimeException must catch SchemaException or
  \InvalidArgumentException; everything else is unchanged (#16). Fits
  the pre-1.0 SemVer allowance.
• IntSchema::positive() (>= 1) and nonNegative() (>= 0) — the named
  intent of ids and counters, thin wrappers over min() with identical
  parse, generator and JSON Schema export (#17).
• Schema::float() — the number type: finite floats only (NaN/INF
  rejected), inclusive min()/max(), allowInt() widening parse to
  whole numbers (normalized to float), generator over the same range,
  export type: number with minimum/maximum (#6).
• Schema::dateTime() — RFC 3339 string on the wire, DateTimeImmutable
  in the PHP domain, inclusive min()/max() bounds, generator over the
  same range, export type: string, format: date-time (bounds recorded
  as a NonRepresentable entry — pure draft 2020-12 has no keyword for
  them), toWire() formats back to the string (#15).
• Format::DateTime strictness aligned with Schema::dateTime():
  rolled-over components (25:00) and trailing data are now rejected
  instead of silently rolling over (#15).
• Schema::discriminated('kind', [...]) — a tagged union: the
  discriminator property selects the branch (checked eagerly as a
  required literal equal to the branch key, so branches are disjoint by
  construction), an unknown or missing tag is its own error at the tag's
  path, and errors inside the branch keep their full paths. Export is
  oneOf. Int and string tags both work (#9).
• Schema::tuple([...]) — a fixed-length heterogeneous list
  (prefixItems + items: false), errors carrying their element index
  ($[1]) (#9).
• ObjectSchema::strip() — the third unknown-key mode: drop unknown keys
  and keep the known ones (the shape for parsing external payloads you
  only trust partially). Mutually exclusive with
  additionalProperties(); the export keeps additionalProperties: true
  and records the drop as a NonRepresentable strip entry (#13).
• Behavior change: additionalProperties() now passes unknown keys
  through into the parse result (the mode's documented purpose —
  round-tripping partially known maps); previously they were tolerated
  but silently dropped, making it indistinguishable from strip (#13).
• Optional coerce() on Schema::int(), Schema::float() and
  Schema::bool(): canonical number/bool strings from query strings and
  forms are accepted and normalized to the typed value (bounds apply
  after the coercion; no leading zeros, no whitespace, no overflow; bool
  strings are the four unambiguous true/false/1/0). The
  generator's domain stays typed; each export keeps its canonical type
  and records a NonRepresentable coerce entry (#8).
• UnionSchema failures now keep structured branch errors:
  ParseError->branches (list<UnionBranch> with the member index and
  the branch's own error paths) instead of a flattened first-error
  summary; SchemaException renders them indented, and parents prepend
  their segment to branch paths (#10).
• ObjectSchema::into(Dto::class) → Combinator\IntoSchema: optional
  hydration of the parsed properties into a DTO via its named-argument
  constructor (after defaults and strip()); a throwing constructor is a
  parse error carrying class names only; the export and the wire form stay
  the object schema's own (#14).
• StringSchema::regexUnchecked($pattern, $generator): an explicit opt-out
  for valid PCRE patterns outside the generatable subset (\z, lookaround,
  backreferences) — the caller supplies the generator, the export records a
  regexUnchecked NonRepresentable entry; the regex() rejection message
  points to it (#7).
• Testing\RoundTrip (+ Testing\RoundTripException): framework-agnostic
  parity assertions for consumers — assertParses(), assertWireRoundTrip()
  and assertConsumerRoundTrip() for a hydrate/wire pair — so the law is
  defined once next to the schema (#18).
• Schema::dateTime() generator emits millisecond-precision moments (the
  wire precision) inside the bounds aligned inwards; a value generated at a
  sub-millisecond bound no longer falls outside it after toWire(). Bounds
  that admit no millisecond-precision moment are rejected at construction.