old: "\x00yo"
new: "oy\x00"

old: #(yo 1 2 #f #t (1 2 3) #(1 2 3))
new: #(#(1 2 3) (1 2 3) #t #f 2 1 yo)

old: #u8(0 1 2 254 255)
new: #u8(255 254 2 1 0)

old: #s8(-128 -127 -2 -1 0 1 2 126 127)
new: #s8(127 126 2 1 0 -1 -2 -127 -128)

old: #u16(0 1 2 65534 65535)
new: #u16(65535 65534 2 1 0)

old: #s16(-32768 -32767 -2 -1 0 1 2 32766 32767)
new: #s16(32767 32766 2 1 0 -1 -2 -32767 -32768)

old: #u32(0 1 2 4294967294 4294967295)
new: #u32(4294967295 4294967294 2 1 0)

old: #s32(-2147483648 -2147483647 -2 -1 0 1 2 2147483646 2147483647)
new: #s32(2147483647 2147483646 2 1 0 -1 -2 -2147483647 -2147483648)

old: #u64(0 1 2 18446744073709551614 18446744073709551615)
new: #u64(18446744073709551615 18446744073709551614 2 1 0)

old: #s64(-9223372036854775808 -9223372036854775807 -2 -1 0 1 2 9223372036854775806 9223372036854775807)
new: #s64(9223372036854775807 9223372036854775806 2 1 0 -1 -2 -9223372036854775807 -9223372036854775808)

old: #f32(-inf.0 -2.0 -1.0 0.0 1.0 2.0 +inf.0)
new: #f32(+inf.0 2.0 1.0 0.0 -1.0 -2.0 -inf.0)

old: #f64(-1e+200 -2.0 -1.0 0.0 1.0 2.0 1e+200)
new: #f64(1e+200 2.0 1.0 0.0 -1.0 -2.0 -1e+200)
[panic] unrecoverable segmentation violation - execution terminated

...more...
lolevel-tests.scm:210: chicken.memory.representation#extend-procedure
lolevel-tests.scm:218: chicken.memory.representation#extended-procedure?
lolevel-tests.scm:222: chicken.memory.representation#procedure-data
lolevel-tests.scm:228: chicken.memory.representation#set-procedure-data!
lolevel-tests.scm:230: chicken.memory.representation#procedure-data
lolevel-tests.scm:240: chicken.memory.representation#block-ref
lolevel-tests.scm:244: chicken.memory.representation#number-of-slots
lolevel-tests.scm:250: chicken.platform#feature?
lolevel-tests.scm:254: chicken.memory.representation#make-record-instance
lolevel-tests.scm:266: chicken.memory.representation#record-instance-type
lolevel-tests.scm:270: chicken.memory.representation#record-instance-length
lolevel-tests.scm:276: chicken.memory.representation#record-instance-slot
lolevel-tests.scm:278: chicken.memory.representation#record-instance-slot-set!
lolevel-tests.scm:280: chicken.memory.representation#record-instance-slot
lolevel-tests.scm:284: chicken.memory.representation#record->vector
lolevel-tests.scm:292: chicken.memory.representation#object-become!     <--