0 : 0
This post was originally entitled "raze curiosity".
It is not raze's fault.
Because map represents a boxed box as an empty box
and raze discards an empty box, we cannot reconstruct
a boxed structure using the paths to the leaves.
Why is {:: a: not
+---+
|+-+|
||0||
|+-+|
+---+
)
] a =: 1;''
+-++
|1||
+-++
#a
2
#;a
1
s
+-+---+
|a|+-+|
| ||b||
| |+-+|
+-+---+
s ,&< S: 0 1 {:: s
+-+----+
|a|+-+ |
| ||0| |
| |+-+ |
+-+----+
|b|+-++|
| ||1|||
| |+-++|
+-+----+
NB. Paths to the leaves
s (; <@;) S: 0 1 {:: s NB. Info lost, cannot reconstruct s.
+-+-+
|a|0|
+-+-+
|b|1|
+-+-+
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