Inconsistent variable highlighting?

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Description

OS X 10.11.2, Sublime Text 3113, Gravity theme, latest MagicPython.

Trying out MagicPython from PythonImproved. In the first Python file I opened, I see:

X_train and X_test are highlighted purple, but y_train and y_test are white. Capitalizing the Y vars turns them purple.

I'm assuming that any word starting with a capital is treated as a "constant" and colored accordingly. Is this intentional? Wouldn't checking for ALL_CAPS be better?

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