When PUTting an S3 object to Localstack with attached Metadata, if a key contains an underscore it is replaced with a dash.

However, when the same request is performed against the real S3, the key is not modified.

Example Input:
key_with_underscores => test

Localstack Result:
key-with-underscores => test

S3 Result:
key_with_underscores => test

Localstack Version: 0.10.5

Tested using AWS v2 S3 client
bucket_name = 'test-bucket-%s' % short_uid()
        self.s3_client.create_bucket(Bucket=bucket_name)
        
        object_key = 'key-by-hostname'
        self.s3_client.put_object(Bucket=bucket_name,
                                  Key=object_key,
                                  Body='something',
                                  ContentType='text/html; charset=utf-8')
        url = self.s3_client.generate_presigned_url(
            'delete_object', Params={'Bucket': bucket_name, 'Key': object_key}
        )
        
        response = requests.delete(url, verify=False)
        self.assertEqual(response.headers['content-length'], '0')
        
        self._delete_bucket(bucket_name, [object_key])
    def test_delete_object_tagging(self):