Bug

Output of python -c "import pydantic.utils; print(pydantic.utils.version_info())":

             pydantic version: 1.6
            pydantic compiled: True
                 install path: /usr/local/Caskroom/miniconda/base/envs/server/lib/python3.8/site-packages/pydantic
               python version: 3.8.3 (default, Jul  2 2020, 11:26:31)  [Clang 10.0.0 ]
                     platform: macOS-10.15.5-x86_64-i386-64bit
     optional deps. installed: ['typing-extensions']

I'm aware that validation does not apply to default values, but it appears that it is no longer applied to user-provided values that have a default factory value, either. If this is expected, I'm not sure if I saw it in the documentation or changelog.

from pydantic import BaseModel, Field
from typing import List

class Child(BaseModel):
    x: int

class Parent(BaseModel):
    children: List[Child] = Field(default_factory=list)


p = Parent(children=[{'x':1}, {'y':2}])

In Pydantic 1.5.1, an error is raised because the second child fails to validate (it is missing required value 'x')

In Pydantic 1.6, the Parent object is instantiated successfully and contains two dicts:

print(p)
# children=[{'x': 1}, {'y': 2}]

To avoid this and recover the expected behavior, validate_all must be set on the Parent class. However, since I'm providing the child value, I'm surprised that I had to ask for it to be validated.