Email field zero width space

[09F911029D74E35BD84156C5635688C0]

EmailField allows a zero width space character to be included which is invalid. [email protected]\u200b and even john@\u200bacme.com are allowed.

I think that first of all CharField should be enhanced to strip the character from both ends of the string, and email field should be enhanced to prohibit it anywhere in the string.

Tested on drf 3.16.1.