v0.7.0

• PropertyConfig rejects a timeoutMs or budgetMs past the value where the
  millisecond-to-nanosecond conversion leaves the integer range, the way it
  already rejected such a shrinkBudgetMs. Above that bound the deadline
  silently stopped being one.
• A corpus document whose keys collide once PHP normalises them — 0 and "0"
  in one encoded array, which no real PHP array can hold — is refused instead of
  losing a pair to array_combine().
• Gen::regex() strips a trailing $ anchor by the parity of the backslash run
  before it, so foo\\$ compiles (literal backslash, real anchor) instead of
  failing on the anchor it mistook for an escaped $.
• A quoted literal in a psalm docblock type may contain the separator of the
  type it sits in: 'a|b'|'c' and array{k: 'x,y'} are read as written, and
  \' inside a literal is unescaped.
• Gen::oneOf() enumerates shrink candidates for objects by identity. The
  previous var_export() key threw on a cyclic object graph and treated two
  distinct objects of equal state as one candidate.
• Gen::forClass() builds its ReflectionClass once instead of once per
  generated value.