<= -- less than or equal

Description

x <= y yields true or false depending on whether x <= y.

Calls upon ? to perform the comparison, if necessary.

For the programmer

The object <= is a keyword.

This operator may be used as a prefix unary operator in an expression like <=y. The user may install a method for handling such expressions with code such as

           <= Y := (y) -> ...

where Y is the class of y.