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e139722e9d
DeferredEvent contains two pointers (void* + function pointer), which are already naturally 4-byte aligned on all ESPHome targets. The struct is 8 bytes with no padding regardless of packed. The packed attribute forces the compiler to use byte-by-byte loads and stores instead of word-aligned access, bloating deq_push_back_with_dedup_ from 163 to 317 bytes due to shift/mask/or sequences for every field access. The packed attribute was added in #7538 likely to guarantee the struct stayed at 8 bytes, but this is already the case without it since both fields are pointer-sized.
