That was a bit of a rabbit hole. As it turns out, neither the ASCII nul character nor its Unicode equivalent have the semantic meaning "end of stream". ASCII do

That was a bit of a rabbit hole. As it turns out, neither the ASCII nul character nor its Unicode equivalent have the semantic meaning "end of stream". ASCII does have control characters for "end of stream", in fact multiple: 0x03 End Of Text, 0x04 End Of Transmission, and 0x17 End Transmission Block. But 0x00 was never intended to be an end marker of any kind. It's really only the C standard that (ab)uses NUL as an end-of-string marker. So yes, after consideration, I'm starting to agree with you. U+0000 is a valid character and should be allowed in text fields.