Python 3.14rc1 doesn't allow t''+'', but string.templatelib.pyi allows it #14479
Description
As per late change (for security), Templates (t-strings) can not be concatenated with regular strings.
Python 3.14 RC1 disallows it:
Python 3.14.0rc1 (tags/v3.14.0rc1:48f8831, Jul 22 2025, 17:09:57) [MSC v.1944 64 bit (AMD64)] on win32
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>>> t''+''
Traceback (most recent call last):
File "<python-input-0>", line 1, in <module>
t''+''
~~~^~~
TypeError: can only concatenate string.templatelib.Template (not "str") to string.templatelib.Template
However, string.templatelib.pyi (main branch, by latest PR) contains
class Template:
...
def __add__(self, other: Template | str) -> Template: ...
Suggest to change to other: Template.