Hein-Pieter van Braam-Stewart 8b1e297fc6 Don't crash on printing nested types ...

When adding an Array or Dictionary to itself operator String() got in an
infinite loop. This commit adds a stack to operator String() (Through
the use of a new 'stringify method'). This stack keeps track of all
unique Arrays and Dictionaries it has seen. When a duplicate is found
only a static string is printed '[...]' or '{...}'.

This mirror Python's behavior in a similar case.

2019-04-20 02:01:55 +02:00

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