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* util.filters: Ensure initialize() never initializes an object twice - and ↵Matthew Wild2010-06-021-10/+13
| | | | return the filter function to the caller
* util.filters: Break processing if a filterer returns nilMatthew Wild2010-06-021-0/+1
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* util.filters: Don't traceback with no filters of a type addedMatthew Wild2010-06-021-2/+4
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* util.filters: Don't traceback when trying to remove a filter from an ↵Matthew Wild2010-06-021-0/+1
| | | | uninitialized object
* util.filters: Expose the initialization functionMatthew Wild2010-06-021-2/+2
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* util.filters: New utility library for managing filters on an objectMatthew Wild2010-06-021-0/+61