[Webkit-unassigned] [Bug 212449] Javascript engine gets confused, calls method on wrong object.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212449

--- Comment #3 from Yusuke Suzuki <ysuzuki at apple.com> ---
This is https://bugs.webkit.org/show_bug.cgi?id=38970

Since Object.render is defined as non-enumerable property, for-in for PayrollRemittanceAgencyEventWizard is listing "render".

You can avoid this issue if,

1. you define render etc. in Object with enumerable: false.

Or

2. If options is truly a shallow option object, you can change

TTBackboneView#initialize

        initialize( options ) {
                //Convert options object to this object properties as early as possible.
                if ( options && typeof options == 'object' ) {
                        for ( const property in options ) {
                                this[property] = options[property];
                        }
                }
        }

to

        initialize( options ) {
                //Convert options object to this object properties as early as possible.
                if ( options && typeof options == 'object' ) {
                        for ( const property in options ) {
                                if (options.hasOwnProperty(property))
                                    this[property] = options[property];
                        }
                }
        }

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