Release v0.13.0 — Core Engine Rebuild · 759401524/pyrs-yaml

[v0.13.0] — 2026-08-10

Rust MSRV raised to 1.96 and edition bumped to 2024 - both crates now
declare rust-version = "1.96" and edition = "2024"; CI pins the
build/test-freethreaded jobs to Rust 1.96 for deterministic wheel builds
and adds an msrv-check job running cargo check/cargo test at the MSRV
to prevent silent MSRV drift (the rust-lint job stays on stable).
The floor is set above PyO3 0.29's own baseline (rustc 1.83) for std API
headroom (e.g. assert_matches!, stabilized 1.96) with no code migration
needed. TAG_REGISTRY (tag handler storage) refactored to
std::sync::LazyLock, dropping the Mutex<Option<...>> indirection.

safe_dump / from_dict / dump_file / dump_iterable: direct writer
— Python→YAML serialization without intermediate CustomNode AST.
Single-pass direct_dump replaces the old two-pass pyobject_to_node +
to_yaml. 7x faster on safe_dump (28ns→4ns), 6x faster on from_dict
(35ns→6ns). (#60)
safe_load / safe_loads / to_dict: fast-path skip anchor tracking
— when input has no & characters, skip collect_anchors + anchor
resolution and use the simpler node_to_pyobject_simple path. (#59)
resolve_core_type: first-byte dispatch whitelist — non-numeric/
non-boolean first bytes return Str immediately, avoiding schema
resolution overhead for the common case. (#59)
granit-parser migration — saphyr-parser replaced with granit-parser
1.0.1 for native Event::Comment emission, eliminating the full-text
scan_yaml() pre-scan. parse_small -18%, parse_large -21%,
roundtrip_large -18%.

float_to_yaml_string round-trip fix — appends .0 when Rust
Display drops the decimal (42 → 42.0) so floats round-trip as
floats instead of becoming ints.
Reverted count_nodes pre-allocation — the full AST traversal cost
more than the reallocations it avoided (serialize_10mb was ~14% slower);
buffer growth is left to the Vec.

max_depth on stream & frontmatter APIs — parse_stream(yaml, on_event, max_depth),
read_markdown(path, schema, max_depth), read_markdown_str(content, schema, max_depth)
accept max_depth (default 1000). Stream parsing now enforces the nesting-depth limit
via core parse_stream_with_options (previously stream events had no depth limit).
Pydantic integration — dump_pydantic() serializes a Pydantic model
to YAML string via model_dump(mode='json') + safe_dump; parse_as()
parses YAML string into a Pydantic model instance. Both use lazy imports,
no hard dependency on pydantic. (#61)

Split py/mod.rs — monolithic 1786-line module broken into
document.rs (YamlDocument), yaml_instance.rs (YAML class),
functions.rs (module-level functions), stream_iterator.rs,
walk_helpers.rs. mod.rs reduced to 128 lines. (#61)
needs_quotes() guard + double_quoted_scalar() constructor —
strings like 'true' / '42' / 'null' now emit as double-quoted
scalars under the core schema instead of being misread on re-parse
(pyobject_to_node + json_value_to_node).
CodSpeed benchmarks unified on codspeed-divan-compat —
exclude-allocations removes allocator noise; cross-library benchmarks
consolidated into tests/test_benchmark_crosslib.py with shared
tests/data/yaml_samples.py fixtures and streaming coverage.