--- /dev/null
+'use strict'
+
+module.exports = decimal
+
+// Check if the given character code, or the character code at the first
+// character, is decimal.
+function decimal(character) {
+ var code = typeof character === 'string' ? character.charCodeAt(0) : character
+
+ return code >= 48 && code <= 57 /* 0-9 */
+}