Validate mapping key uniqueness #1221
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According to YAML spec 1.2.2:
The changes proposed here check the uniqueness of scalar mapping keys, throwing a
NonUniqueMapKeyexception when by inserting a new key/value pair an identical scalar key is already present in a mapping. Non identical but equivalent scalar content, for example “0o13” (octal) or “0xB” (hexadecimal), are not considered.Address #60.