The normalizedFunctionString helper needs to be updated to standardize the string representation of named functions during testing. For example, passing in either of the following functions:

function () {}

or

function func () {}

should result in the same string representation:

'function () {}'

This will fix a bug in which there are discrepancies between the results of calling toString in the browser vs. in node, which becomes relevant when testing js-bson in the browser.