by Ricardo Fernández Serrata
Allows a flow (and user) to access any value in a nested (tree) container at runtime, regardless of depth. Mixed containers are also supported.
Suppose this flow is a function named "A". This is a table of identities:
x = A(x)
x = A(x, any_falsy_value)
x[k] = A(x, [k])
x[k_0][k_1][k_2]... [k_N] = A(x, [k_0, k_1, k_2, ... k_N])
x... [N] = A(x, N+1)
x... [N-1] = A(x, N)
For better performance (and to guarantee that the loop will halt if Infinity is used) when x becomes null (or it's already null) the loop breaks
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