The framework merges a component's defaults with the options specified by the user at runtime. Default options for a component are registered by the component developer using the
fluid.defaults() function. The framework combines these values with those supplied by the user to the component creator function.
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Left unchecked, this options merging code becomes unruly and verbose. The vast majority of merging can be taken care of by a simple call to a standard "object merging function" such as
jQuery.extend - however, there are a few cases where this behaviour is inappropriate, and where manual merging code might still be required.