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Introduces CodecChain, a frozen dataclass that chains array-array, array-bytes, and bytes-bytes codecs with synchronous encode/decode methods. Pure compute only -- no IO, no threading, no batching. Also adds sync roundtrip tests for individual codecs (blosc, gzip, zstd, crc32c, bytes, transpose, vlen) and CodecChain integration tests. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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This PR adds synchronous methods to stores that benefit from executing IO outside of an event loop, i.e. memory storage and local storage. These methods are not defined on the ABC, and are instead defined as protocols that stores can opt into.
These methods are needed to unlock a hot path for chunk encoding / decoding that avoids event loop and
to_threadoverhead.part of #3720
builds on #3722 and #3721