Sort review

[rakudrama]

https://github.com/dart-lang/dump-info-visualizer/blob/master/web/polymer_lib/tree_table.dart#L67

The sorting of rows by nonSortablePriority should be separated from sorting by data value.

There is a clash between a/b and d1/d2
I'd call them row1/row2 and value1/value2

How do we parameterize the sorting semantically?
For names, the user might want to choose between default ordering and 'smart' ordering with public names before private names, the ordered AaBbCc, with embedded numbers sorted numerically and qualified names sorted by this order on the individual identifiers, and dart: libraries following other libraries.