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`Retry` behaviour

See original GitHub issue

I tried to use very wrong retry policy:

val always: (Request[IO], Either[Throwable, Response[IO]]) => Boolean = (_, _) => true
Retry[IO](RetryPolicy(RetryPolicy.exponentialBackoff(maxWait = 1.second, maxRetry = 5), always))(client)

As expected, on each successful POST call, http4s retried it, but strangely enough with extra body attached.

My call code is like:

      httpClient.expect[ExpectedResponse](
        Request[IO](
          method = Method.POST,
          uri = uri / "resource",
          headers = headers,
        ).withEntity(payload.asJson),
      )

Assuming, that payload is {"one": 1, "other": "value"}, in logs I after 5th retry I got:

[2021-10-26T07:15:12.460Z] [error]     [DEBUG] 07:15:01 [TestKit.scala:58] HTTP/1.1 POST https://uri/resource Headers(Authorization: <REDACTED>, Content-Length: 446, Content-Type: application/json, Accept: application/json) body="{"one": 1, "other": "value"}{"one": 1, "other": "value"}{"one": 1, "other": "value"}{"one": 1, "other": "value"}{"one": 1, "other": "value"}{"one": 1, "other": "value"}

Payload was attached 6 times, once in original request and 5 more times with each retry (first retry contained doubled body, next one - tripled, etc)

Is that expected behaviour?