add .sliceToImmutable?

[bakkot]

In many use cases you want to take a snapshot of some mutable data. The snapshot should be immutable, but the original data remains mutable.

Right now, that requires two steps: mutable.slice(0).transferToImmutable(). In practice I would guess that the intermediate mutable copy is quite cheap. But it may be worth checking this assumption with engines to verify this, because if the intermediate mutable copy is actually expensive, it could be worth adding another method to combine these steps into one.

[phoddie]

FWIW – sliceToImmutable() is included in @erights' slides in the Open Questions section.

sliceToImmutable(start?: number, end?: number) :ArrayBuffer

[bakkot]

Ah, nice, sorry I missed that. I'll leave this open as a place to track for now.