Shared or Split Tooltip NOT working with Boost Module

[yoderexploder]

Expected behaviour

A shared or split tooltip should work with or without Boost module enabled

Actual behaviour

A shared or split tooltip does NOT work with Boost module enabled

Live demo with steps to reproduce

Not working, Boost Enabled: http://jsfiddle.net/7kk7L60k/
Working, Boost Disabled: http://jsfiddle.net/7kk7L60k/1/

Affected browser(s)

Tested in Chrome and Safari

[TorsteinHonsi]

Fails since v5.0.13, specifically 152e7e5.

[jon-a-nygaard]

Internal Note: Goes bad due to the getHoverData is looking for hoverPoints on the series.points. series.points contains shimmed points without x values.
Possible solutions:

1. Go back to using searchKDTree. Its likely to cause regressions somehow.
2. Add the property x to the shimmed points.