v1.3.0

• Added: Gen::naughtyString() — whole string values known to break
  text-handling code, drawn from a curated list kept in the package (#172, after
  BlackBox's Set::strings()->unsafe()): empty and whitespace-only strings, a
  trailing newline ("a\n" passes /^[a-z]+$/), NUL and control bytes,
  numeric-looking text, "null"/"true", quotes and escapes, SQL, markup,
  template, format-string, shell and header injection shapes, path traversal,
  Unicode normalisation, case-mapping, direction and homoglyph traps, invalid
  UTF-8, and lengths past common limits. A failing value shrinks through the
  entries listed before it; the generator is Enumerable, so exhaustive: true
  checks every entry.
• Added: Gen::mixed() — a value of any PHP type, for properties about
  code that takes mixed and must narrow it without a TypeError (#173, after
  BlackBox's Set::type()): null, booleans, ints, floats including NAN,
  ±INF and -0.0, Unicode strings, DateTimeImmutable, and lists, string-
  and int-keyed arrays, stdClass and ArrayObject nested up to $maxDepth.
  A value shrinks to null, false, 0, '' and [] first. Closures,
  anonymous classes, resources and enums are left out; a counterexample holding
  an object is stored in the corpus as a seed entry. Gen::forParameters()
  keeps refusing a mixed parameter.
• Changed: Gen::string(), Gen::stringAscii(), Gen::stringOf() and
  Gen::char() are boundary-biased like the numeric generators: about one draw
  in ten is '', ' ', '0', and for the Unicode generators "\n", "a\n" or
  a decomposed é, whichever fit the length range. EdgeCases::None turns it
  off. Gen::stringFrom() and Gen::bytes() are unchanged.
• Changed: what a given seed generates through the string generators —
  and every generator built on them, Gen::forClass()/forParameters() string
  parameters included — has shifted (compatibility policy §2).
  FilesystemCorpus::SEQUENCE_EPOCH is now 3: seed entries recorded under
  epoch 2 are dropped on recall, values entries keep replaying.