assoc bypasses validators ?

[cournape]

I was surprised by the following:

from attr import assoc, attr, attributes
from attr.validators import instance_of


@attributes
class Foo(object):
    a = attr(validator=instance_of(int))


foo = Foo(1)
try:
    foo = Foo("1")
except TypeError:
    pass
else:
    raise ValueError()

try:
    foo2 = assoc(foo, a="1")
except TypeError:
    pass
else:
    raise ValueError("Could set Foo.a to a string value")

I would expect new instances set through assoc to go through validators. Is this a bug, or is it expected ?

[hynek]

Yeah assoc has a design problem so we're replacing it with attr.evolve. Check the CHANGELOG for PRs/issues. Mainly #135