Make toJs work on mori structures inside of JS structures

[dmitrig01]

Input:

m.toJs({ "a": m.vector(1, 2) })

Expected output:

{ "a": [ 1, 2 ] } // a JS array inside of a JS object

Actual output:

{ a: [ 1 2 ] } // a Mori vector inside of a JS object

Does this make sense?

[ivan-kleshnin]

:+1: I'm also expecting from toJs to return only native datatypes.