address what happens when users use break in for-loop

[jankdc]

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Bench report

Common-op timings on ubuntu-24.04:

array-of-objects, memory source, n=100,000, cap=256.

operation	bote	JSON.parse	bote/parse
get · shallow	32.8 µs	37.77 ms	0.00086x
get · deep	993.2 µs	37.47 ms	0.026x
has · shallow	32.2 µs	37.88 ms	0.00085x
walk · walk-all	33.3 µs/item	37.60 ms	88.54x
iter · iter-all	35.2 µs/item	38.02 ms	92.67x
walk · walk-get-name	65.4 µs/item	49.84 ms	131.28x