fix: re-add option to switch off unique mapping keys enforcement #856
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This PR partially reverts 309c9d1 while keeping unique mapping keys enforcement as default behaviour for
Unmarshal
.The rationale is that libraries like
ghodss/yaml
relies onuniqueKeys
being set tofalse
. Giving the possibility to do so would allow the upgrade ofgo-yaml
tov3
without introducing breaking changes.