Don't depend on Fiddle features which aren't in Ruby 3.0 #66
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The fiddle gem has changed more than I thought! We can't depend on CONST_STRING being available, nor the Fiddle::Type module. Thankfully, passing strings in as VOIDP or CONST_STRING works the same, and we don't need to look at any string results, so we can just use the old/new types interchangeably.