ffe4301fe2
The code ```js linesInfo && linesInfo[type] ``` performs a lot of dynamic lookups on the `Boolean.prototype`, as the *ToBoolean* operation let's `true` pass for `linesInfo` (which might itself be concerning that this can be a boolean). Instead of the coercion, the code should properly check for valid objects via `typeof` and strict equality with `null` comparison. This is a non-breaking performance fix.