minor technical on 11.2.2 Effective boolean value

11.2.2 Effective boolean value
The working group has asked for feedback on this feature.  My specific
feeling is that it would be better to have type errors if non-boolean
values are used for boolean operands.  There are functions and operations
available that the user can use to explicitly test non-boolean values
and create a boolean value.  For example ?x != 0 can be used to test
whether a numeric value is non-zero.

Fred Zemke