And there are many reasons why there are so many string types nowadays.

True.

Simply use {mode objfpc}{$h+} like lazarus suggests.

I think the root cause of all these problems are generic types. They cause more 
trouble than they avoid. I would suggest that noone never uses such generic 
types but uses shortstring or ansistring (or...) as they need. Telling people 
to simply use this or that compiler switch is not the solution (you have to 
explain this over and over again). Generic types should be the exception and 
not the norm. It begs for trouble in many situations. Using strict types also 
lets the user read more about the nature of these types and therefore knows 
more about possible side effects. Someone who has shortstings in mind when 
using strings would surely use it in a different way as someone who has 
ansistrings in mind (provided he knows how they are handled by the compiler). 
And telling people clearly about the implementation of these different types is 
much better than obscuring them by generic types.


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