[intro.defs] Should the definition of 'signature' explicitly exclude default template arguments?
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Description
The definition of 'signature' for function template in N4687 [defns.signature.templ] says:
signature
〈function template〉 name, parameter type list (11.3.5), enclosing namespace (if any), return type, template-head, and requires-clause (17.4.2) (if any)
It could be read to mean that default template arguments, which are declared in the template-head, are part of the signature.
Should the standard somehow clarify that default template arguments are not included in the signature?
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