The validators attribute of a declared config option makes tries to parse
arguments to validators as python literals. If all arguments can be
parsed, they are passed to a validator factory with original types. If at least one
argument is not a valid Python literal, all values are passed as a string
(this was the previous behavior). Space characters are still not allowed inside
arguments, use the \\x20 symbol if you need a space in a literal (#7615
<https://github.com/ckan/ckan/pull/7615>_)::
# Not changed
validators: v(xxx) # v(“xxx”)
validators: v("xxx",yyy) # v(“xxx”, “yyy”)
validators: v(1,2,none) # v(“1”, “2”, “none”)
validators: v("hello\\x20world") # v(“hello world”)
# Changed
validators: v("xxx") # v(“xxx”)
validators: v("xxx",1) # v(“xxx”, 1)
validators: v(1,2,None) # v(1, 2, None)