don't flush the tree when evaluating the *-argument conditionals #2947
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This is a follow-up to PR #2942. Given that the short-circuiting is now explicitly skipped for node trees containing the special argument, it should no longer be necessary to flush the conditional branch of the sexp tree. (The .cache field is already skipped for special-arg nodes.)
The sexp tree is still explicitly flushed for
every-time
andevery-time-argument
.