fix typo (patch from Gustavo Massaccesi)
Closes PR 12489
Merge to 5.2.1
(cherry picked from commit 96dea8c732
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@ -431,7 +431,7 @@ not be used if @racket[vec] is immutable.}
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[prop-val any] ... ...)
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[prop-val any] ... ...)
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(and/c box? chaperone?)]{
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(and/c box? chaperone?)]{
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Like @racket[prox-box], but with support for immutable boxes. The
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Like @racket[impersonate-box], but with support for immutable boxes. The
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@racket[unbox-proc] procedure must produce the same value or a
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@racket[unbox-proc] procedure must produce the same value or a
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chaperone of the original value, and @racket[set-proc] must produce
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chaperone of the original value, and @racket[set-proc] must produce
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the same value or a chaperone of the value that it is given. The
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the same value or a chaperone of the value that it is given. The
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