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Optional and Default Parameters

Are there any plans to include something on the order of Zetalisp &Optional
field in the parameter list for functions?  I (and others) find it
mildly annoying to have to explicitly provide streams to operations such
as print, display, and format as one example.  It would be nice to be
able to have the stream argument be optional and have some reasonable
default (i.e. standard-output or terminal-output).  This kind of facility
would also be useful for user applications as well.