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Source for wiki ImmediateStringsCoalesced version 3
== Are immediate strings coalesced? ==
Asked to evaluate `(let ((a "hello") (b "hello")) (eq? a b))`, Racket, Gauche, MIT, Gambit, Chicken, Bigloo, SISC, Chibi, Chez, SCM, !Ikarus/Vicare, Mosh, KSi, !SigScheme, !TinyScheme, Scheme 9, Dream, S7, BDC, XLisp, Rep, Schemik, Elk, UMB, Oaklisp, and Owl Lisp all return `#f`.
Scheme48/scsh, Guile, Kawa, Larceny, Ypsilon, !IronScheme, NexJ, STklos, Shoe, RScheme, JScheme, VX, Sagittarius return `#t`.
There may be some false negatives here, because an implementation might coalesce literals in the compiler but not at the REPL.