Value of 'NIL in (THE NIL (PROGN 'NIL)) is NIL, not a NIL. about cl-unicode

[phoe]

Seems like this only manifests with optimize safety and/or debug, not on default optimization settings. My compiler policy:

* (sb-ext:describe-compiler-policy)
  Basic qualities:
COMPILATION-SPEED = 1
DEBUG = 3
SAFETY = 3
SPACE = 1
SPEED = 1
INHIBIT-WARNINGS = 1
  Dependent qualities:
SB-C::CHECK-CONSTANT-MODIFICATION = 1 -> 3 (yes)
SB-C::TYPE-CHECK = 1 -> 3 (full)
SB-C::CHECK-TAG-EXISTENCE = 1 -> 3 (yes)
SB-C::LET-CONVERSION = 1 -> 0 (off)
SB-C:ALIEN-FUNCALL-SAVES-FP-AND-PC = 1 -> 3 (yes)
SB-C:VERIFY-ARG-COUNT = 1 -> 3 (yes)
SB-C::INSERT-DEBUG-CATCH = 1 -> 3 (yes)
SB-C::RECOGNIZE-SELF-CALLS = 1 -> 0 (no)
SB-C::FLOAT-ACCURACY = 1 -> 3 (full)
SB-C:INSERT-STEP-CONDITIONS = 1 -> 3 (full)
SB-C::COMPUTE-DEBUG-FUN = 1 -> 3 (yes)
SB-C:STORE-SOURCE-FORM = 1 -> 3 (yes)
SB-C::PRESERVE-SINGLE-USE-DEBUG-VARIABLES = 1 -> 3 (yes)
SB-C::INSERT-ARRAY-BOUNDS-CHECKS = 1 -> 3 (yes)
SB-C::STORE-XREF-DATA = 1 -> 3 (yes)
SB-C:STORE-COVERAGE-DATA = 1 -> 0 (no)
SB-C::INSTRUMENT-CONSING = 1 -> 1 (no)
SB-C::STORE-CLOSURE-DEBUG-POINTER = 1 -> 0 (no)
SB-KERNEL:ALLOW-NON-RETURNING-TAIL-CALL = 1 -> 0 (no)

I have safety and debug always restricted to 3.

[phoe]

Duplicate of #24