Add tests for non-string key types #2
Merged
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https://datatracker-ietf-org.lucaspardue.com/doc/draft-rundgren-cbor-core/ allows for key types besides string.
This adds tests proving that non-string key types are supported.
DAG-CBOR restricts map keys to string type. However, serde_ipld_dagcbor, the crate from which this crate was forked did not restrict key types in practice. We add some tests to prove it.