relational operators

• numeric comparisons:

  • < > <= >= == != <=>
  • <=> returns -1, 0, or 1 depending on whether the left argument is numerically less than, equal to, or greater than the right argument

• string comparsions:

  • lt gt le ge eq ne cmp
  • cmp returns -1, 0, or 1 depending on whether the left argument is stringwise less than, equal to, or greater than the right argument

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