[Bug-apl] Enclosed scalars in execute-each

[Kacper Gutowski]

It was troublesome in the past and it's still not bug free.
Consider this:

      0 0≡ ⍎¨'00'
0

It should be 1, but the value returned by ⍎¨'00' is a vector of
enclosed scalars, i.e. something that's impossible in APL type system.

-k