PEP 750: disallow str + Template

It was mentioned here: PEP 750: Tag Strings For Writing Domain-Specific Languages - #196 by jimbaker

And has been discussed in some depth starting here: PEP 750: Tag Strings For Writing Domain-Specific Languages - #207 by nhumrich

With a resolution of this subdiscussion AFAICT at PEP 750: Tag Strings For Writing Domain-Specific Languages - #226 by dkp

The final resulting note in the rejected ideas section doesn’t mention security concerns: PEP 750 – Template Strings | peps.python.org

It also doesn’t distinguish between implicit literal-only and explicit concatenation.

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