Modifying a compiled block! should reset its compiled state

[earl]

Let's start with a simple code block:

w> x: 99 
== 99
w> c: [x]
== [x]
w> do c
== 99 ;; Fine
w> compiled? c
== true

If we now change the block's content, the compiled flag is not reset:

w> append c [* 2]
== [x * 2]
w> c
== [x * 2]
w> compiled? c
== true

Now it could be that it's just marked as "dirty" and recompiled the next time it's evaluated. But no, evaluating the block again returns an unexpected result:

w> do c
== 99 ;; expected: 198

[Geomol]

Modifying a block instance now reset compilation. But APPEND doesn't change the block instance. INSERT and REMOVE does. It's possible to have several block instances of the same array. (Issue can be closed/deleted.)

[Geomol]

APPEND now reset compilation state.