Kochava / envi / 21

97%

Pull #5

travis-ci

Add depth checks for cyclical / nested types

This change affects all unmarshaling for nested values but prevents
infinitely recursing while trying to unmarshal cyclical types.

This adds a max depth of 8 for structs where no fields are defined
whatsoever. The counter is reset if a value if the struct containing
the field has any other field set. If the struct has no other fields,
then depth cannot be reset right now.

Further improvements could be made to use an optional interface to scan
for known keys. This just deals with the immediate problem of unbounded
recursion.

Fixes #4.

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