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A general description is here.
‘capabilities()’ gains a new logical option ‘Xchk’ to avoid warnings about X11-related capabilities.
The internal implementation of ‘grid’ units has changed, but the only visible effect at user-level should be: a slightly different print format for some units (especially unit arithmetic); faster performance (for unit operations); and two new functions ‘unitType()’ and ‘unit.psum()’. Original code contributed by Thomas Lin Pedersen.