in src/Tasks/Common/MSBuildUtilities.cs [59:67]
private static bool ValidBooleanFalse(string parameterValue)
{
return ((String.Compare(parameterValue, "false", StringComparison.OrdinalIgnoreCase) == 0) ||
(String.Compare(parameterValue, "off", StringComparison.OrdinalIgnoreCase) == 0) ||
(String.Compare(parameterValue, "no", StringComparison.OrdinalIgnoreCase) == 0) ||
(String.Compare(parameterValue, "!true", StringComparison.OrdinalIgnoreCase) == 0) ||
(String.Compare(parameterValue, "!on", StringComparison.OrdinalIgnoreCase) == 0) ||
(String.Compare(parameterValue, "!yes", StringComparison.OrdinalIgnoreCase) == 0));
}