Enum construction from float worked in v2.6.4 but fails in v2.7.1

[Idealcoder]

Initial Checks

• I confirm that I'm using Pydantic V2

Description

Constructing an enum from a float worked in v2.6.4 but fails in v2.7.1.

Is this an intended change or a regression?

I see some changes around enum validation have been made #9064, pydantic/pydantic-core#1235 @samuelcolvin

Example Code

from enum import Enum

from pydantic import TypeAdapter

class MyEnum(Enum):
    A = 1
    B = 2

ta = TypeAdapter(MyEnum)

assert ta.validate_python(1.0) is MyEnum.A
assert ta.validate_python(2.0) is MyEnum.B

# pydantic=2.6.4 passes validation

# pydantic=2.7.1 fails validation
#
# pydantic_core._pydantic_core.ValidationError: 1 validation error for enum[MyEnum]
#   Input should be 1, 2 or 3 [type=enum, input_value=1.0, input_type=float]
#     For further information visit https://errors.pydantic.dev/2.7/v/enum

Python, Pydantic & OS Version

pydantic version: 2.6.4
        pydantic-core version: 2.16.3
          pydantic-core build: profile=release pgo=false
                 install path: {redacted}\site-packages\pydantic
               python version: 3.9.15 | packaged by conda-forge | (main, Nov 22 2022, 08:39:05) [MSC v.1929 64 bit (AMD64)]
                     platform: Windows-10-10.0.19045-SP0
             related packages: fastapi-0.106.0 mypy-1.0.1 pydantic-settings-2.2.1 typing_extensions-4.10.0
                       commit: unknown


             pydantic version: 2.7.1
        pydantic-core version: 2.18.2
          pydantic-core build: profile=release pgo=false
                 install path: {redacted}\site-packages\pydantic
               python version: 3.9.15 | packaged by conda-forge | (main, Nov 22 2022, 08:39:05) [MSC v.1929 64 bit (AMD64)]
                     platform: Windows-10-10.0.19045-SP0
             related packages: fastapi-0.106.0 mypy-1.0.1 pydantic-settings-2.2.1 typing_extensions-4.11.0
                       commit: unknown

[sydney-runkle]

@Idealcoder,

Thanks for reporting this. Looks like a regression we should fix in 2.7.2. Adding this to the relevant milestone. Just got back form a week off, so I'll dive into more 2.7 fixes shortly!