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A realm now has String, Number, RegExp and Date as ECMAScript 5.1 sections 15.5, 15.7, 15.9 and 15.10 define them, with Annex B's substr, getYear, setYear and toGMTString. - String: every ES5 prototype method; split, replace, match and search take strings and RegExps. Each new string's length is checked against the heap limit before it is built, and scans take fuel. - Number: toString(radix), toFixed, toExponential and toPrecision format from the number's exact decimal value. - RegExp: a backtracking matcher keeps its choice points and capture state on the heap, within the heap room left, and takes fuel for every step, so a catastrophic pattern stops at the fuel limit. Patterns nested past Options::max_depth give a SyntaxError. Flags g, i and m, lastIndex, exec, test and toString. - Date: chrono converts days to calendar dates, shifting by whole 400-year cycles past its years. Realm::set_clock and Realm::set_time_zone set the clock and local time (UTC by default). Without a hint, a Date converts to a primitive as a string. cargo xtask test262 also runs the suite's built-ins tests for the four and prints their counts.