buildout-versions case-sensitivity bug?

buildout.cfg

[buildout]
extensions = buildout-versions
versions = versions
parts = foo

[foo]
recipe = zc.recipe.egg:scripts
eggs = Pyramid
       zilch
scripts = zilch-web

[versions]
zc.buildout = 1.5.2
zc.recipe.egg = 1.3.0
buildout-versions = 1.7
pyramid = 1.0
zilch = 0.1.2

transcript

$ python2.6 bootstrap.py
$ bin/buildout
  # this is where I expect it to get pyramid 1.0
  # on *one* of my machines a similar (but larger) buildout.cfg used pyramid 1.3a3 instead
  # until I changed the 'eggs = ' line to spell 'pyramid' all in lower case
  # most interesting bit was where bin/buildout -vv said 'Picked pyramid == 1.3a3' with pyramid in lower case!