facet-rs / facet / 19935223201

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feat(facet-xml): fix attribute namespace matching and add deny_unknown_fields option

- Fix #1060: Unprefixed XML attributes are now correctly matched regardless
  of ns_all setting. Per XML Namespaces spec, unprefixed attributes are
  always in "no namespace" and don't inherit the default xmlns.

- Add DeserializeOptions with deny_unknown_fields for runtime control (#1059)
  - New from_str_with_options() and from_slice_with_options() functions
  - Option is combined with #[facet(deny_unknown_fields)] attribute

- Add comprehensive error case tests (35 new tests) covering:
  - Malformed XML parsing errors
  - Type mismatches and invalid values
  - Missing/optional/default field behavior
  - Unknown field rejection with deny_unknown_fields
  - Nested structs, enums, collections, text content

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