Re: RFC: Enabling or disabling tracing shell functions

[Dan Douglas]

Not sure exactly how zsh does it but I know not having the option for
both global and local tracing can be annoying.

The two big ways of handling xtrace I mostly see are either bash's
global `set -x` or ksh93's per-function tracing, and it can be
annoying to be missing either one. There are tricks for getting the
effect of global xtrace and/or DEBUG traps in ksh, but its lack of a
BASH_XTRACEFD equivalent means it's sometimes impossible to hide the
side-effects of those tricks, so you get messy output.

With regards to `typeset -ft`, I don't like it. DEBUG and RETURN have
totally different usages. Inheriting RETURN very rarely makes sense,
but I almost always want DEBUG inherited because of course it's
primarily used for debugging.