REST API doesn't work with fully qualified branch names

The REST API doesn't appear to work with fully qualified branch names (e.g refs/heads/master) returning a 400 Bad Request on my local machine and a 404 on stash-dev. The same call with the unqualified branch names (i.e master) works as expected.

Doesn't work:
https://stash-dev.atlassian.com/rest/api/latest/projects/STASH/repos/stash/commit/refs%2Fheads%2F1.0/changes?to=refs%2Fheads%2Fmaster&start=0&limit=1000

Works:
https://stash-dev.atlassian.com/rest/api/latest/projects/STASH/repos/stash/commit/1.0/changes?to=master&start=0&limit=1000