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  • The 'throw away' temporaries are handy for ad hoc code, mainly: that was the context in which the initial query arose. Commented Aug 24, 2018 at 20:22
  • 5
    @JosephWright yes but one person's ad hoc code ends up being someone else's go-to package 20 years later:-) Commented Aug 24, 2018 at 20:24
  • I just got bitten by \@tempdima being used both by \rule and by \l@section: I was hacking into \l@section and trying to use the \@tempdima configured by it in the parameters of an extra \rule, but to no avail of course as \rule itselfs resets \@tempdima. Commented Aug 25, 2018 at 9:59