Updated version number to 0.23.1-SNAPSHOT
Fixed #190: imported, wrapped functions not accepting `null` and `undefined` as function arguments.
Added constant `null`
Changed the default number of significant digits for BigNumbers from 20 to 64.
Function `typeof` now recognizes regular expressions as well.
Extended the documentation of function `typeof`
Whoops removed accidentally pasted code
Functions `equal` and `unequal` support `null` and `undefined` now (see #190)
Objects `Complex`, `Unit`, and `Help` now return their string representation when calling `.valueOf()` (see #190)
Fixed #187: changed the behavior of the conditional operator (a ? b : c) to lazy evaluation.
Fixed a test
Released version 0.24.0