bug: Wrong parameter order in AnnotableMeta.

[gerrymanoim]

The following code which was working as of 3ce4f2a is now no longer working. Reasonably sure it is because of the changes in 088169a around constructing the __signature__ in AnnotableMeta (088169a#diff-1ba248744f86eb25b4e863648c19353294f34c47b637d1fe88d66eccfc1e1119R100-R108).

import ibis.expr.operations as ops
import ibis.expr.rules as _rlz
import ibis.expr.types as ir

class SomeOp(ops.ValueOp):
    a = _rlz.instance_of(ir.TableExpr)
    b = _rlz.optional(_rlz.instance_of(ir.TableExpr), default=None)
    c = _rlz.instance_of(bool)

now raises

Traceback (most recent call last):
  File "/home/gmanoim/tmp/tmp.py", line 5, in <module>
    class SomeOp(ops.ValueOp):
  File "../ibis/common/grounds.py", line 116, in __new__
    signature = inspect.Signature(
  File "../python3.9/inspect.py", line 2817, in __init__
    raise ValueError(msg)
ValueError: non-default argument follows default argument

[cpcloud]

I believe this is intentional so that we conform to Python's signature restrictions. @kszucs would know more.

[kszucs]

That wasn't intentional, so this is a valid issue. Thanks @gerrymanoim for reporting!

[cpcloud]

Ah, great! Thanks for the quick fix @kszucs.