IIRC typeof null -> "object" was a mistake - but too late to fix now due to
backwards compatibility issues.
By the way...
toString.call(variable) === '[object Array]'
...is risky because you are defaulting to toString on global object - e.g.
window. Anyone could shadow toString on window and then your framework
breaks
safer version is...
Object.prototype.toString.call(variable) == '[object Array]'
(=== not required)
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