#lang scribble/doc @(require (file "base.ss")) @title[#:tag "number"]{Number utilities} @defmodule[(planet untyped/unlib/number) #:use-sources ((file "number.ss"))]{ Useful number utilities. @defproc[(number+false? [item any]) boolean?]{ Returns @scheme[#t] if @scheme[item] is a number or #scheme[#f].} @defproc[(integer+false? [item any]) boolean?]{ Returns @scheme[#t] if @scheme[item] is an integer or #scheme[#f].} @defproc[(natural? [item any]) boolean?]{ Returns @scheme[#t] if @scheme[item] is an natural number (>= 0).} @defproc[(natural+false? [item any]) boolean?]{ Returns @scheme[#t] if @scheme[item] is an natural number (>= 0) or @scheme[#f].} } @;{end defmodule}