yaml12 0.2.0

Formatting

• format_yaml() and write_yaml() now produce more human-readable YAML while
  preserving exact round trips:

  • The new integer width argument defaults to 80 columns and wraps long
    strings at safe word boundaries. Pass None to disable wrapping.

  • Strings are emitted without quotes when YAML 1.2 permits. Strings that the
    core schema would read as null, a boolean, or a number remain quoted,
    including arbitrary-sized decimal, octal, and hexadecimal integer strings.

  • Multiline strings use readable folded or literal block styles when
    possible. Paragraph breaks, leading whitespace, empty lines, trailing
    newlines, and embedded document markers round-trip unchanged. Other
    multiline strings use a quoted fallback.

• Mapping keys longer than YAML's 1,024-character simple-key limit now use
  explicit key syntax.

• Non-finite floats now use the canonical spellings .Inf, -.Inf, and
  .NaN while continuing to round-trip as floats.

• write_yaml() and format_yaml(..., multi=True) no longer add optional
  document end (...) markers. Written documents still begin with --- and
  end with a newline.

Parsing and file handling

• By default, parse_yaml() and read_yaml() now preserve tags in the
  tag:yaml.org,2002: namespace that are not converted to built-in Python
  values in a Yaml wrapper. Explicit handlers still run when supplied.

• The parser now accepts and ignores reserved directives such as %***, and
  treats indented --- text as part of a multiline plain scalar.

• write_yaml() gains an append argument for adding complete YAML documents
  to a filesystem path. Its default behavior still replaces the file.
  read_yaml() and write_yaml() also expand paths beginning with ~ using
  os.path.expanduser().

Installation

• Prebuilt wheels now include Intel macOS, Windows ARM64, and CPython 3.14
  free-threaded builds. Free-threading support is currently beta. Source builds
  now require Rust 1.83 or newer.