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[Bug 19988] New: add a [LenientFloat] to mean "ignore IDL attribute assignment or method call if a non-finite float is passed"

From: <bugzilla@jessica.w3.org>
Date: Fri, 16 Nov 2012 23:27:51 +0000
To: public-script-coord@w3.org
Message-ID: <bug-19988-3890@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=19988

          Priority: P2
            Bug ID: 19988
                CC: bzbarsky@mit.edu, mike@w3.org,
                    public-script-coord@w3.org
          Assignee: cam@mcc.id.au
           Summary: add a [LenientFloat] to mean "ignore IDL attribute
                    assignment or method call if a non-finite float is
                    passed"
        QA Contact: public-webapps-bugzilla@w3.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: cam@mcc.id.au
          Hardware: PC
            Status: NEW
           Version: unspecified
         Component: WebIDL
           Product: WebAppsWG

It sucks a bit that the various canvas APIs have to take "unrestricted float"
and explicitly do nothing when non-finite Number values are passed/assigned to
them.  We could add a [LeninentFloat] extended attribute that can be put on IDL
operations that return void and have one or more float arguments (or union
types that have a float in them) and writable IDL attributes of type float,
which would mean that when converting the value to the IDL float, NaNs and
infinities cause the invocation to return and do nothing rather than throwing.

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