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MEMORY USAGE over-counts short keys of hashes with field TTLs (inline keys since #490) #497
Description
field_expiry::watch_entry_size(key_len) returns size_of::<(Entry, Instant)>() + 1 + key_len. That assumes the key is a heap-allocated String. Since #490, Entry's key is a KeyBytes, which keeps keys of up to 23 bytes inline, so for those keys MEMORY USAGE of a hash with field TTLs counts about key_len bytes that were never allocated.
The current tolerances in tests/memory_usage_accuracy.rs still pass. Fix: count key_len only when KeyBytes would put the key on the heap.
Found while reviewing #496.
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