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 = '/foo/bar/key-by-hostname'
        content_type = 'foo/bar; charset=utf-8'
        self.s3_client.put_object(Bucket=bucket_name,
                                  Key=object_key,
                                  Body='something ' * 20,
                                  ContentType=content_type)
        url = self.s3_client.generate_presigned_url(
            'get_object', Params={'Bucket': bucket_name, 'Key': object_key}
        )
        
        response = requests.get(url, verify=False)
        self.assertEqual(response.headers['content-type'], content_type)
        
        response = requests.get(url, headers={'Range': 'bytes=0-18'}, verify=False)
        self.assertEqual(response.headers['content-type'], content_type)
        self.assertEqual(to_str(response.content), 'something something')
        
        self._delete_bucket(bucket_name, [object_key])
    def test_s3_head_response_content_length_same_as_upload(self):