dbDelta not parsing enum correctly

[janjakes]

Given an enum definition such as:

enum('a', 'b')

The dbDelta function parses it as:

enum('a',

Which causes a change to be detected on every execution. I'm also afraid other cases with spaces (like strings with spaces in enum values, etc.) will cause similar problem since the regular expressions in the dbDelta function seem to cover only some particular cases.