tango.core.Array is a very important module, almost everyone use it every day, and it's a very useful module of string handling.
recent trunk version of tango.core.Array.contains says:
* Performs a linear scan of buf from $(LB)0 .. buf.length$(RP), returning
* true if an element matching pat is found. Comparisons will be performed
* using the supplied predicate or '<' if none is supplied.
'<' or '==' ?
