Note, OP_NOTIF is not completely equivalent to OP_NOT OP_IF. OP_NOT operates on a VM Number (as the inverse of OP_0NOTEQUAL), while OP_NOTIF checks the "truthy-ness" of a stack item like OP_IF.
OP_NOTIF
OP_NOT OP_IF
OP_NOT
OP_0NOTEQUAL
OP_IF
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Note,
OP_NOTIFis not completely equivalent toOP_NOT OP_IF.OP_NOToperates on a VM Number (as the inverse ofOP_0NOTEQUAL), whileOP_NOTIFchecks the "truthy-ness" of a stack item likeOP_IF.