"Float" property value may be set to a floating point value via Material Inspector when Node Mode is "Integer"

How to reproduce:
1. Open the user’s attached “UnityBugShaderGraphFloatAsInteger” project
2. Select the “Assets → MyMaterial” Material in the Project Browser
3. Change “MyInt” field to a floating point value

Expected result: Inspector doesn’t let to change to a non-integer value
Actual result: Any rational number may be set

Reproducible with: 10.10.0 (2020.3.38f1), 12.1.7 (2021.3.8f1), 13.1.8 (2022.1.13f1), 14.0.2 (2022.2.0b4), 15.0.0 (2023.1.0a5)

Reproduced on: macOS 12.3 (Intel)

Note:

• “Default” Node field works as expected
• Related issue forum thread:
  https://forum.unity.com/threads/integer-mode-behaves-as-float-in-inspector.936149/