fixed/sfixed types convert to float

[acetylen]

According to the protobuf language guide, fixednn and sfixednn are integer types. However, when betterproto generates dataclasses it treats them as floats.

$ cat foo.proto
syntax = "proto3";
package foo;

message Foo {
  fixed32 bar = 1;
  sfixed32 baz = 2;
  fixed64 qux = 3;
  sfixed64 quux = 4;
}

$ protoc --python_betterproto_out . foo.proto
Writing foo.py
$ cat foo.py
# Generated by the protocol buffer compiler.  DO NOT EDIT!
# sources: foo.proto
# plugin: python-betterproto
from dataclasses import dataclass

import betterproto


@dataclass
class Foo(betterproto.Message):
    bar: float = betterproto.fixed32_field(1)
    baz: float = betterproto.sfixed32_field(2)
    qux: float = betterproto.fixed64_field(3)
    quux: float = betterproto.sfixed64_field(4)

• betterproto 1.2.2 (from pypi)
• protoc 3.6.1
• python 3.7.3