:   '''::[tcl::unsupported]::yieldm''' ?''value''?
This is just like [yield], except that it causes the coroutine command to accept arbitrarily many arguments and will return the [list] of those arguments (i.e., an empty list if there are no arguments, a single-element list if there is one, a pair for two, etc.)

[AMG]: Is any progress being made towards officially adopting this command or a variation thereof?

[MS] did not see any: no TIP, no requests

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