Tag Property (usually unspecified)

none Unspecified tag (automatically resolved by application)
! Non-specific tag (by default, !!map/!!seq/!!str)
!foo Primary (by convention, means a local !foo tag)
!!foo Secondary (by convention, means tag:yaml.org,2002:foo)
!h!foo Requires %TAG !h! <prefix> (and then means <prefix>foo)
!<foo> Verbatim tag (always means foo)
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