RomanText writer doesn't write "slow 3/8" #1417
Description
music21 version
8.0.0a12
Problem summary
If music21 reads a RomanText file in "slow 3/8", then writes it out again, it writes it in "3/8" (which defaults to "fast 3/8"), omitting the "slow". The output file will likely be unreadable since it may contain beats that are then illegal, e.g., "b2".
Steps to reproduce
>>> from io import StringIO
>>> rntxt = """Time Signature: slow 3/8
... m1 C: I b2 V"""
>>> s = music21.converter.parse(rntxt, format="romanText")
>>> text_stream = StringIO()
>>> s.write("romanText", text_stream)
>>> newrntxt = text_stream.getvalue()
>>> print(newrntxt) # NB not "Slow 3/8"
Composer: Composer unknown
Title: Title unknown
Analyst:
Proofreader:
Time Signature: 3/8
m1 C: I b2 V
>>> s2 = music21.converter.parse(newrntxt, format="romanText")
[rest of TraceBack clipped]
raise RomanTextTranslateException(
music21.romanText.translate.RomanTextTranslateException: too many notes in this measure: m1 C: I b2 V
I will see if I can't fix this myself.