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P1788 The group has discussed interval constructors at various times and there is probably a consensus that there should be these, where REAL means an unspecified floating point type and STRING a text-string type. nums2interval(REAL l, REAL u) constructs [l,u] if l <= u. num2interval(REAL x) same as nums2interval(x,x). Vienna§4.1. text2interval(STRING t) on the lines of Vienna §6.