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The official underscore.js uses this check to find out if something is really an object

// Is a given variable an object?
_.isObject = function(obj) {
  return obj === Object(obj);
};

UPDATE

The updated underscore.js library is now using the following, because of a previous bug in V8 and minor micro speed optimization.

// Is a given variable an object?
_.isObject = function(obj) {
  return typeof obj === 'function' || (typeof obj === 'object' && !!obj);
};