Slurp breaks structure if quoted.

[gilch]

Example:

; '|' is cursor
(1 2 3 '[|] 4 5 6)
; C-0 s
(1 2 3 '[| 4 5 6)

The [ isn't balanced. This is no longer valid structure. What probably should have happened:

(1 2 3 '[| 4] 5 6)

The syntax-quote ``` has the same effect.

Backwards slurp also has problems.
It breaks structure in some cases:

; back slurp a set literal
(1 2 3 #{|} 4 5 6)
; C-9 s
(1 2 #{3 |{} 4 5 6)

This is no longer valid structure. There's an extra {. What probably should have happened:

(1 2 #{3 |} 4 5 6)

Backwards slurping a quoted form simply deletes the quote.

(1 2 3 '[|] 4 5 6)
; C-9 s
(1 2 3 [|] 4 5 6)

What probably should have happened:

(1 2 '[3 |] 4 5 6)

[laurentpetit]

@thickey do you feel like you could take a look at it?