Bare carriage return in comment

[moorereason]

Given the input # this is a test\ra=1, this package decodes the input as a=1.

Reproduction

https://play.golang.org/p/YhQC0y2Dd5w

toml.Unmarshal([]byte("# this is a test\ra=1"), &v)

Or with the toml-test decoder:

$ echo "# this is a test\ra=1" | toml-test-decoder2
{
  "a": {
    "type": "integer",
    "value": "1"
  }
}

Expectation

I would expect an error. \r is not an allowed control character for a comment. Without an trailing line feed (\n), it should not be considered a newline sequence (\r\n).

I found this issue while doing differential fuzzing against go-toml. Interestingly, go-toml also doesn't return an error, but it does treat the whole line as a comment.