test(reader): cover DecimalEncodingDecoder (was untested)#84
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Add DecimalEncodingDecoderTest: accepts/encodingId, every DecimalType width (1/2/4/8/16/32 bytes), unknown values_type, buffer-too-small, and the missing/empty/invalid metadata guards. 100% line + branch. values_type is encoded as an explicit field-1 varint so the proto3 default (0) is present on the wire (DecimalMetadata(0).encode() omits it → reads as empty). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Add DecimalEncodingDecoderTest: accepts/encodingId, every DecimalType width
(1/2/4/8/16/32 bytes), unknown values_type, buffer-too-small, and the
missing/empty/invalid metadata guards. 100% line + branch.
values_type is encoded as an explicit field-1 varint so the proto3 default (0)
is present on the wire (DecimalMetadata(0).encode() omits it → reads as empty).
Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com