Definitions like "def-{…}" and footnotes

Question

If I use a structure like
def-{-minus-}
A-Bfootnote{A-B}

then the result is the expected A-minus-B in the main text area, but the footnote only contains AB.
I did more testing, it seems that the def- declarations like the above are simply ignored in the footnotes.
Is there a way to fix this?

curious · Answer

The above discussion makes it clear that redefining - is a bad idea.
Nevertheless, I need "my versions" of some characters, and here is my solution: basically, it is in the flavour of defa-{-minus-} mentioned above, but it reuses the one-letter literal command (I changed it to g) for multiple characters:
usepackage{ifthen}

mathchardefmyhyphen="2D

newcommand{g}[1]{%
  ifthenelse{equal{#1}-}{myhyphen}{}%
  ifthenelse{equal{#1}=}{equiv}{}%
  ifthenelse{equal{#1}+}{oplus}{}%
}

The result can be seen via $g+ g= g-$: it suits my needs.

Definitions like "def-{…}" and footnotes

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