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sbclPackages.named-readtables: fix build with SBCL 2.6.0
SBCL commit 00eabf5 changed the readtable's base-char-macro-array to store 0 instead of NIL for non-macro characters. Since (if 0 ...) is truthy in Common Lisp, the named-readtables readtable iterator incorrectly yields all characters, causing assertion failures in check-reader-macro-conflict when packages like cl-interpol, pythonic-string-reader, and antik-base merge readtables. Apply upstream fix from melisgl/named-readtables@6eea566.