Add ValueGroupCollection class for managing meta command output
Add zsh describe with complex array snippet
support complex data structure for zsh _describe
use array_merge to merge groups
make sure example works
Fix group value add
must set grouped value with label
test iterator
Rename ValueGroupCollection to ValueCollection
call setGroupLabel
update doc blocks
Add zsh _meta_command test
Fix _meta command for getting group labels
show completion groups with label
Add more shell tests
More completion values
more completion examples
Add zsh array expansion snippet