Avoid potential corruption during unpack of static_variant #250
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This was referenced Feb 6, 2024
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NOTE: this PR was merged but later reverted in #253, and #254 is to redo it.
Before this change, when
sv.set_which(w.value)is already done and the followingsv.visit(...)throws, thestaic_variantobject passed into the function may be updated to something incomplete and may cause unintended problems.Although usually we don't reuse
static_variantvariables, it's not guaranteed.This does lead to additional data copy.
Reference: https://gitlab.syncad.com/hive/hive/-/merge_requests/1049