Error when using filter to query Decimalfield type variable

[ddx64]

One line description of the issue

Environment: djongo 1.3.6, Django 3.1.12

Python script

from djongo import models

class xxx(models.Model):
    price = models.DecimalField(max_digits=10, decimal_places=2)

#  commands under Django shell
from aaa.models import xxx
from bson.decimal128 import Decimal128

xxx.objects.filter(price=Decimal128('20.55'))

#  I tried using deicmal.Decimal, but that would raise another probelm:
#  bson.errors.InvalidDocument: cannot encode object: Decimal('20.55'), of type: <class 'decimal.Decimal'>

Traceback

Traceback (most recent call last):
TypeError: conversion from Decimal128 to Decimal is not supported

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
django.core.exceptions.ValidationError: ['“20.55”should be a decimal numeral。']