[MusicXML] Tempo marking with decimal not handled correctly

1. Open attached mscz (produced in 1.3).
2. 'File'>'Export…'.
3. Choose 'MusicXML'.
4. 'Save'.
5. Open MusicXML.

Expected result (taken from mscz):

Actual result:

Note: Also attached is the produced MusicXML.

Using MuseScore 2.0 Nightly Build 12b4b1c - Mac 10.7.5.