These are the other-immediate types. We specify them including all low eight bits, including the other-immediate tag, so we can think of the type bits as one type – not an other-immediate major type and a subtype. Also, fetching a byte and comparing it against a constant is more efficient than wasting even a small amount of time shifting out the other-immediate tag to compare against a five bit constant.
Number (< 30)
bignum 10
ratio 14
single-float 18
double-float 22
complex 26
Array (>= 30 code 86)
Simple-Array (>= 20 code 70)
simple-array 30
Vector (>= 34 code 82)
simple-string 34
simple-bit-vector 38
simple-vector 42
(simple-array (unsigned-byte 2) (*)) 46
(simple-array (unsigned-byte 4) (*)) 50
(simple-array (unsigned-byte 8) (*)) 54
(simple-array (unsigned-byte 16) (*)) 58
(simple-array (unsigned-byte 32) (*)) 62
(simple-array single-float (*)) 66
(simple-array double-float (*)) 70
complex-string 74
complex-bit-vector 78
(array * (*)) -- general complex vector. 82
complex-array 86
code-header-type 90
function-header-type 94
closure-header-type 98
funcallable-instance-header-type 102
unused-function-header-1-type 106
unused-function-header-2-type 110
unused-function-header-3-type 114
closure-function-header-type 118
return-pc-header-type (a.k.a LRA) 122
value-cell-header-type 126
symbol-header-type 130
base-character-type 134
system-area-pointer-type (header type) 138
unbound-marker 142
weak-pointer-type 146
structure-header-type 150