Accessing float field gives different value than provided

[aabmass]

I had a look around but couldn't find an existing issue. There is some strange rounding with float fields when the value is accessed on an instance vs encoded:

>>> import proto
...
... class Animal(proto.Message):
...     size = proto.Field(proto.FLOAT, number=1)
...
>>> a = Animal(size=0.95)
>>> a
size: 0.95

>>> a.size
0.949999988079071

Why is a.size significantly different from the value I provided? Also the textproto produced by stringifying and the value produced by to_dict() are correct:

>>> Animal.to_dict(a)
{'size': 0.95}
>>> Animal.to_dict(a)["size"] == a.size
False

Environment details

• Programming language: Python 3.13
• OS: Linux
• Language runtime version: 3.13
• Package version: proto-plus==1.25.0

Steps to reproduce

>>> import proto
...
... class Animal(proto.Message):
...     size = proto.Field(proto.FLOAT, number=1)
...
>>> Animal(size=0.95)
size: 0.95

>>> Animal(size=0.95).size
0.949999988079071

[aabmass]

I realized that protobuf floats are 32 bits vs python floats are 64 bits and it works correctly for proto.DOUBLE fields. Is there a way to access the "correct" value on an instance, similar to how stringifying and to_dict() do it?