* Provide error messages for debugging, with links to online explanation

* Mark a function for special use by Sizzle * @param {Function} fn The function to mark

* Mark a function for special use by Sizzle * @param {Function} fn The function to mark

* is returns a boolean for if typeof obj is exactly type.

* Splits block of text into lines. * @param {String} block Block of text. * @return {Array} Returns array of lines.