id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
31806	Make validators include the provided value in ValidationError	Jon Dufresne	Jon Dufresne	"It is sometimes desirable to include the provide value in a custom error message. For example:

{{{
“blah” is not a valid email.
}}}

By making built-in validators provide `value` to `ValidationError`, one can override an error message and use a `%(value)s` placeholder.

This placeholder `value` matches an example already in the docs:

https://docs.djangoproject.com/en/3.0/ref/validators/#writing-validators
"	New feature	closed	Forms	dev	Normal	fixed			Ready for checkin	1	0	0	0	0	0