Puppet sends warnings and errors to stdout

When I run
<pre>
puppetmasterd --compile myclient.example.net >myclient.yaml
</pre>
then the output file contains
<pre>
ESC[0;36mnotice: Compiled catalog for myclient.example.net in 40.23 secondsESC[0m
{"data":{"edges":[... (one very long line of data) ...
</pre>

The "notice:" line should have been sent to stderr, not to stdout, so that it does not get mixed in with the YAML data.