Changelog

0.2.2 (2026-10-22)

The precompiled x86_64-unknown-linux-gnu NIF in 0.2.0 and 0.2.1 needed glibc 2.33 or newer and failed to load on e.g. Debian 11 and Ubuntu 20.04. It is now built with cross like the other Linux targets, so it runs on older glibc versions again.

parse/2 with ruby: true reads plain values the way Ruby's Psych does, for YAML written by Ruby (e.g. Rails serialized columns). Psych follows YAML 1.1 and writes strings like 1e5 or 1.5e3 without quotes; with this option they stay strings instead of becoming floats.

Quoted strings whose continuation lines are not indented, as written by Ruby's Psych on older Ruby versions, are parsed like libyaml does instead of returning an "invalid indentation in quoted scalar" error.

parse/1 no longer raises :nif_panicked on empty input (or input with only comments). It returns {:ok, nil}.
parse/1 no longer raises :nif_panicked on .inf, -.inf and .nan (in any of their spellings, e.g. .Inf or .NAN). They are returned as :infinity, :neg_infinity and :nan, as the BEAM has no such floats.
Merge keys with a list of mappings (<<: [*a, *b]) are now merged instead of being silently dropped.
parse/1 no longer raises ArgumentError on inf, nan and infinity without a leading dot. They are returned as strings.
The Hex package no longer contains stray macOS NIF builds.

Inputs larger than 20 KB are parsed on a dirty CPU scheduler, so parsing a large document no longer blocks a normal BEAM scheduler.
About 10-15% faster, as the parsed document is no longer copied before it is converted.
rustler is now an optional dependency, only needed to build the NIF from source, and any rustler_precompiled ~> 0.8 is accepted. Apps no longer get rustler and its HTTP dependencies pulled in.
True, TRUE, False and FALSE are parsed as booleans instead of strings, following the YAML 1.2 core schema.
.NaN is parsed as :nan instead of the string ".NaN".
Updated to yaml-rust2 0.13 (which also fixes an infinite loop on some short documents) and rustler 0.38.
Added a precompiled NIF for aarch64-unknown-linux-musl (Alpine on ARM).