array limits on arm ampere

I've recently started using oracle cloud and I
notice that I can't allocate an array of >= 4M characters.

On intel with
 *features*
(:REGEXP :WILDCARD :SYSCALLS :I18N :LOOP :COMPILER :CLOS :MOP :CLISP :ANSI-CL
 :COMMON-LISP :LISP=CL :INTERPRETER :LOGICAL-PATHNAMES :MT :SOCKETS
 :GENERIC-STREAMS :FFI :GETTEXT :UNICODE :BASE-CHAR=CHARACTER :WORD-SIZE=64
 :PC386 :UNIX)
(length (make-array  (* 1024 1024 4)
        :element-type 'character
        :fill-pointer t :adjustable t))
=> 4194304

but on ampere with
*features*
(:READLINE :REGEXP :WILDCARD :SYSCALLS :I18N :LOOP :COMPILER :CLOS :MOP :CLISP
 :ANSI-CL :COMMON-LISP :LISP=CL :INTERPRETER :LOGICAL-PATHNAMES :SOCKETS
 :GENERIC-STREAMS :SCREEN :FFI :GETTEXT :UNICODE :BASE-CHAR=CHARACTER
 :WORD-SIZE=64 :UNIX)
*** - string too long: desired length 4194304 exceeds the supported maximum length

Both say
array-dimension-limit
4294967296
(interestingly, one MORE than impnotes says should be the value
for a 64 bit cpu)


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