Glom assign using a Check filter

Question

I'm trying to use the glom.assign operator to deeply assign and only set on one of the children in a list. As a complication, the correct child to set depends on a property of that child. Can I use assign and Check to assign some children's values, based on properties of the contained elements?

As as simple example, trying to get the float value from the list works. But using the same spec with assign fails (stack trace hidden for clarity):

>>> from glom import glom, Check, SKIP, assign
>>> test = {"root": [{"name": "child1", "type": "bool", "value": True},
                     {"name": "child2", "type": "int", "value": 1,},
                     {"name": "child3", "type": "float", "value": 1.0}]}
>>> spec = ("root", [Check("type", equal_to="float", default=SKIP)], "0", "value")
>>> glom(test, spec)
1.0

>>> assign(test, spec, 2.0)
...
TypeError: path argument must be a .-delimited string, Path, T, or S

How should I do property-based filtering when using glom's assign?

(I have glom-20.11.0 installed.)