The JavaScriptCompiler API docs sample code is broken as of 4.6

[romannurik]

Just a note, that the sample code for subclassing JavaScriptCompiler in the docs is broken as of ~4.6 with:

TypeError: name.toLowerCase is not a function

(It works with handlebars 4.5 but fails with 4.6)

You can test this by swapping the handlebars.js version used in the linked jsfiddle with the latest version (4.7.7).