(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.

• Numbers and characters are compared using ==.

• Arrays are equal if they have the same length, and each element is equal to the corresponding element in the other array.

• Strings are equal if they have the same length and the same characters.

• Tables are equal if they have the same set of keys (based on key-equivalence), and if each value is equal to the corresponding value in the other table.

• Otherwise, two values are equal if they share the same identity.

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.