After redefining ~ via \def it remains \protected in an \edef, although \show
does not say so
```
\starttext
\def~{Z}
\show~
\edef\foo{~}
\show\foo
\stoptext
```
Tested 2025/08/02 with ConTeXt ver: 2025.07.21 11:50 LMTX fmt: 2025.7.31
int: english/english from TeXLive2025.
Originally reported at https://tex.stackexchange.com/q/749050/293669
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