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@chaley: From looking at the code, the best approach seems to be to allow TemplateFormatter to take an argument formatter_funcs which defaults to None. When None, it uses the global formatter_funcs, otherwise it uses the local one. Then have each db object keep its own copy of the formatter_funcs() with its funcs loaded. In get_metadata()/proxy_metadata() it will pass in a formatter to the Metadata() object that uses this copy instead of the gloabl formatter_funcs()
I could be way off base, however.
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