Improve use of boolean defaults #23564
                
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A couple of cases where recursing with default booleans was especially confusing.
Spellcheck would like to change booleans to beanpoles.
I know the project hates so-called style PRs.
But if I see something morally wrong, I cannot but act upon it.
I must confirm that inlined helper such as
jsig1allowstailrec. Maybe it's enough to annotate jsig? Edit: I see goto 0 only. With tailrec, it complains about the RHS of the helperinline def jsig1, which is spurious.