Previously it was !{, but in real examples this looked confusing since an exclamation point after a word looks (to humans) like literal punctuation rather than syntax. % is not ideal either since it's also the marker traditionally used for printf, but has the advantage that programmers are already primed for it to be syntax.
Description
fork of https://github.com/hashicorp/hcl
because issue :
https://github.com/hashicorp/hcl/issues/290
these code permit use of "nested" field decoding which is just composite struct
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