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Hello!

The u's and x's are syntactically quite similar. Semantically, they are 
totally different, though. Whereas an "x" creates a list of dates, an "u" 
introduces an unspecified digit.

The difference is important when handling an L2Interval. Whereas

189u-02-08/1902-01-05

makes sense, I consider that

189x-02-08/1902-01-05

does not make sense.

In other words, I suggest to rewrite the section on masked dates to keep 
x's and u's apart.

Regards!

SaaĊĦha,