* release: 0.26

* use trusted publishing for release

* Bump PyO3 to 0.27

Update pyo3 dependency to 0.27. Replace deprecated DowncastError with
CastError.

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Co-authored-by: David Hewitt <[email protected]>

* Update `pyo3` to 0.28.0.

* fixup, bump MSRV to 1.83

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Co-authored-by: David Hewitt <[email protected]>

* feat: Support serde_json's arbitrary_precision feature

* docs: Describe arbitrary_precision feature in readme. Update changelog. ci: Run tests for arbitrary_precision feature.

* fmt

* opt out of default serde-json features

---------

Co-authored-by: David Hewitt <[email protected]>

…hewitt#105)

…hewitt#107)

The guard s.len() != 1 used byte length, causing depythonize::<char>
to return Err(InvalidLengthChar) for any non-ASCII single-codepoint
character (e.g. 'ä' U+00E4 is 1 codepoint but 2 UTF-8 bytes).

Fix: use s.chars().count() != 1 which counts Unicode codepoints.
A test for the multibyte-codepoint case is added to de.rs.

Co-authored-by: lefty <[email protected]>

…vidhewitt#108)

tests/test_collections.rs (18 tests): Vec<T>, HashMap, BTreeMap, tuples
tests/test_structs.rs (12 tests): structs, serde rename, Option<T>, deny_unknown_fields

Co-authored-by: lefty <[email protected]>

* Update to PyO3 0.29

* update abi3 to py38 in workflow