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Less types and more functions.
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| As lisp programmers have know for a long time it is better to have a smallish number of ubiquitous data types and a large number of small functions that work on them, than to have a large number of data types and a small number of functions that work on them. |
But in order to understand the statement keep in mind Lisp has no strong typing.
All Lisp functions should work on the generic data types like array, map,...
If you look at ML, F# or haskell then you'll see that you can have both. You can define generic functions which work on complicated data structures and keep the types distinguishable.
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But of course all string functions should also work on the "Content" property of the file. But a file is usally more than just a string. You have a FileName and maybe other functions which allow to process the file sequentially. You don't want to load the big files completely into the RAM.