`<string>`: Should `string::substr` forward the allocator to the newly created `string`?

The C++ Standard doesn't say that: https://eel.is/c++draft/string.substr

https://github.com/microsoft/STL/blob/5aae6780236208577b4e8a000cbe7aa3cbc24c41/stl/inc/xstring#L4673-L4676

@CaseyCarter agreed. He also assumed that we'll fix this when implementing WG21-P2438 but I still decided to create an issue to not forget about it.

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`<string>`: Should `string::substr` forward the allocator to the newly created `string`? #3022

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	_NODISCARD _CONSTEXPR20 basic_string substr(const size_type _Off = 0, const size_type _Count = npos) const {
	// return [_Off, _Off + _Count) as new string
	return basic_string{*this, _Off, _Count, get_allocator()};
	}

<string>: Should string::substr forward the allocator to the newly created string? #3022

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`<string>`: Should `string::substr` forward the allocator to the newly created `string`? #3022