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Should ":" be an extended alphabetic character?
By my reading of the Thrice Revised Report, in implementations that truely
support ":" as an extended alphabetic character it should be the case
(eq? 'user:cons 'lisp:cons) => #F
Yet in implementations where ":" provides access to a Common Lisp style
package system it will be the case that this returns #T.
Thus it seems to me that the two are incompatible. If you wish to permit
Scheme implementations to access a package system using ":", while
continuing to conform to the definition of the language, then you have to
give ":" some status other than extended alphabetic.