3.0.0

Changed

• BREAKING — YAML constructs this parser does not model now throw instead of being silently dropped.
  Tags, anchors, aliases, complex keys, and a %YAML directive for anything other than 1.2
  previously produced a value that was not in the document — !!str 42 came back as the
  number 42, and an alias came back as null. Returning an invented value is worse than
  refusing, because nothing downstream can tell the difference.
• A floating-point literal that overflows Double now throws rather than returning infinity.
  Infinity is not what 1e400 rounds to; it means the value is absent.

Added

• ParseError cases naming the unsupported construct, so a caller can report which part of
  the document it could not read.