ben-manes / caffeine / #5679

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Key Tencent photo variants by format and size

A photo is stored as a distinct blob per (id, format, size category),
but the reader keyed by (id, return_size), using the byte count as a
proxy for the variant. Two variants of a photo that return the same
byte count then alias, overstating the hit rate. Key by the format and
size category the trace records, keeping the returned bytes as weight.

4192 of 4203 branches covered (99.74%)

8471 of 8475 relevant lines covered (99.95%)

1.0 hits per line