Bugzilla

With bug 1666009 we can mark these array functions taking a callback as "LargeInlinableFunction". However we still can't inline them afterwards.

The problem seems to be the line:
```javascript
var T = arguments.length > 1 ? arguments[1] : void 0;
```
In particular the `arguments[1]` access marks the script as uninlineable: https://searchfox.org/mozilla-central/source/js/src/jit/IonAnalysis.cpp#3800
As far as we know we use `arguments[1]` instead of having a second `thisArg` parameter because otherwise `function.length` would be 2. I don't really know what we should be doing here.

With bug 1666009 we can mark these array functions taking a callback as "LargeInlinableFunction". However we still can't inline them afterwards.

The problem seems to be the line:
```javascript
var T = arguments.length > 1 ? arguments[1] : void 0;
```
In particular the `arguments[1]` access marks the script as uninlineable: https://searchfox.org/mozilla-central/source/js/src/jit/IonAnalysis.cpp#3800
As far as I know we use `arguments[1]` instead of having a second `thisArg` parameter because otherwise `function.length` would be 2. I don't really know what we should be doing here.