[Maxima] assume() question.

[Thomas Widlar]

We use Maxima version: 5.13.99rc2.

The function “assume” works for <, > etc, but not for
the operators “equal” and “notequal” as it should
according to the online help. 

Example:

(%i22) assume (z equal 3);
  Incorrect syntax: EQUAL is not an infix operator
  assumeSpace(zSpaceequalSpace
            ^
(%i22) assume (z > 3);
(%o22) [z>3]
(%i23)

What are we getting wrong? 

Thanks.