(eq? ..args)
  args: two or more arguments (any type)
  returns a bool

Returns #t if all of its arguments are equal to one another.

Each successive pair of arguments is compared in turn. If any of the comparisons are false, the function returns early.

This behaviour can be overridden for objects and RData by defining an op-eq? method. If (.op-eq? a b) returns #f or #n, then a and b are not equal.