converters are not executed during fields assignment for classes created by attrs.make_class

[ngchihuan]

Hi @hynek,
I run into this problem with using converters for classes made by attrs.make_class.
Better explained with the following code.
Let me know if you need more information!

Python: 3.10
attrs version: 24.2.0

C = attrs.make_class("C",{"x": attrs.field(default=0, converter=int)})
C(x="0")
type(x) == int

However, converter is not applied when fields are assigned after the initialization.

C = attrs.make_class("C",{"x": attrs.field(default=0, converter=int)})
c= C()
c.x = "0"
type(c.x) == str

[hodgestar]

Just noting that one can work around this by specifying on_setattr explicitly:

>>> from attrs import setters
>>> DEFAULT_SETATTR = setters.pipe(setters.convert, setters.validate)
>>> C = attrs.make_class("C",{"x": attrs.field(default=0, converter=int)}, on_setattr=DEFAULT_SETATTR)
>>> c = C("0")
>>> c.x
0
>>> c.x = "5"
>>> c.x

Although it took me a bit of digging in the source code to find that.

[hynek]

Unfortunately, that's not something we can change now anymore, so we'll improve the docs.