pbxProject.prototype.addToHeaderSearchPaths #13 issue, still appeared.

[GlausLi]

if (!buildSettings['HEADER_SEARCH_PATHS']) {
      buildSettings['HEADER_SEARCH_PATHS'] = [INHERITED];
}

This can be changed like this?

if (!buildSettings['HEADER_SEARCH_PATHS']
            || buildSettings['HEADER_SEARCH_PATHS'] === INHERITED) {
            buildSettings['HEADER_SEARCH_PATHS'] = [INHERITED];
        }

[GlausLi]

Library search path is already implemented like it.
but header search path is not.

[brodycj]

Contribution of PR with test suite would be much appreciated. Maintainers have been completely overloaded. My apologies.