Aliases in FilterExtensionGetRequest model are not working

[thomas-maschler]

FilterExtensionGetRequest uses pydantic.Field instead of attr.ib to define aliases. This does not work and fields filter_crs and filter_lang are not recognized.

from stac_fastapi.extensions.core.filter.request import FilterExtensionGetRequest
filter = FilterExtensionGetRequest(filter="test", filter_crs="EPSG:4326")

# >>> TypeError: FilterExtensionGetRequest.__init__() got an unexpected keyword argument 'filter_crs'

filter = FilterExtensionGetRequest(filter="test", **{"filter-crs":"EPSG:4326"})

# >>> TypeError: FilterExtensionGetRequest.__init__() got an unexpected keyword argument 'filter-crs'

When trying to define the fields using attr.ib hypen aliases are not excepted

from typing import Optional

import attr

from stac_fastapi.types.search import APIRequest
from stac_fastapi.extensions.core.filter.request import FilterLang

@attr.s
class FilterExtensionGetRequest(APIRequest):
    """Filter extension GET request model."""

    filter: Optional[str] = attr.ib(default=None)
    filter_crs: Optional[str] =  attr.ib(alias="filter-crs", default=None)
    filter_lang: Optional[FilterLang] =  attr.ib(alias="filter-lang", default="cql2-text")

# >>>  File <attrs generated init __main__.FilterExtensionGetRequest>:1
#    def __init__(self, filter=attr_dict['filter'].default, filter-crs=attr_dict['filter_crs'].default, filter-lang=attr_dict['filter_lang'].default):
#                                                                 ^
# SyntaxError: invalid syntax

I tried various other approaches including adding an __init__ method to sanitize fields name with hyphens but that didn't play nice with create_async_endpoint.

What was the reason to use attr classes over Pydantic classes for GET Request Models?