fix: binding the methods to the context

[massi-ang]

Issue #, if available:
Fixes #1465
Description of changes:
Added context binding

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[massi-ang]

Apparently this is an issue only with Electron, or at least the setup I am using where, the node-http-handler is being used. I do not observe the same behaviour in a pure browser application.
Assuming you need the timing variable, the correct fix is to use arrow functions (bind did not work as this after compilation is not what I expected). I pushed the new change.