In section 7.3 and 8.2 the function 'findstring' is recommended as a means to search a space separated list for a given value. This suggestion is problematic as findstring really searches for substrings. So, for example
$(findstring car,bicicle airplain carriage) will return a non-empty value. Instead it seems that 'filter' should be used for this kind of problem.
Should the documentation in those sections be modified to note the problem and suggest using filter as an alternative?