perf: reduce call of has when not necessary

[cesco69]

just a micro-optimization.

Reduces overhead in hot LRU operations by avoiding has() checks when a direct cache-entry lookup is sufficient.

[augmentcode]

🤖 Augment PR Summary

Summary: Reduces overhead in hot LRU operations by avoiding has() checks when a direct entry lookup is sufficient.

Changes: delete() and expiresAt() now gate on this.items[key] presence and reuse the retrieved item.

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[augmentcode]

Review completed. 1 suggestions posted.

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[cesco69]

augment review

[augmentcode]

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[avoidwork]

that's previously been a deopt due to the type assignment and verification. do you have an IR render that shows it's ok? i used to use irhydra, and then deoptigate to verify that path.