SOLVED: Non-Reactive Memo for Reactive Values?

I wish to perform a memoized calculation on demand rather than optimistically.

Here we see createMemo running optimistically:
https://playground.solidjs.com/anonymous/63165594-60fe-4ff2-966f-620574dd5761

Here i've solved the problem by manually tracking the dirty state
and determining whether to recalc or just return at call time:
https://playground.solidjs.com/anonymous/21a6530b-632c-46df-80d6-48ddd75ba665

I'm fine with this solution, but i just wanted to check that i'm not missing anything obvious

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