Overflowing timeline in a multi-timeline recurrence relation's general case that should be cought by its base case

[pt7k]

Tau version: 0.7 (v0.7-alpha-162-gc534f60)
Build: c534f60
OS: Ubuntu

** Summary **
I was trying to use a two time-line recurrence relations, but there is a major inconvenience when the recurrence is evaluating the edge timeline between its base case and general case. Even though a proper base case is declared before the general case, the relation still tries to use its general case going into negative timeline index, I believe, and throwing out (Warning) shift creation: left < right. It manages to skip that part with just a warning, so there is no crashing or hanging, but due to the multi-timeline nature of this example the problem keeps on accumulating further down the recurrence spamming the output with lots and lots of warnings.

** Input **

r[0,0]() := 0
r[0,b]() := r[0,b-1]()
r[t,0]() := r[t-1,0]()
r[t,b]() := r[t,b-1]()
n r[1,0]()

** Screenshot **

** Notes **
In this situation I would be expecting the base case to take priority over the general case, thus eliminating any potential errors or warnings due to evaluation of the latter. I also tried to work around it by supplying all 4 of r[0,0] r[0,1] r[1,0] r[1,1] initial values in the defs, but it only delayed the problem into the subsequent step.

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