[racket] Requiring SRFI

Is there an easy way to require everything in a given SRFI, while
specifying that in a case of name conflict, I want to use the built-in
racket version?

I'm specifically thinking about srfi/13, the string library.  I want to
include that, but I think Racket's newly added string functions (such as
string-trim and string-join) are better than the ones in the srfi.
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