libyaml makes every '?' in flow context a mapping-key indicator, so it
parses '{ ?foo: bar }' as a key 'foo' (dropping the '?') and '[?x]' as an
empty single-pair mapping. Per ns-plain-first a '?' followed by a
flow-safe character (anything but whitespace, end of input, or a flow
indicator) begins a plain scalar.
Gate the '?' key-indicator dispatch on isBlankZ or, in flow context, a
flow indicator, so '?foo' and '?x' stay plain-scalar content. Hoist the
flow-indicator predicate into CharacterClass and reuse it in the plain
scalar scanner. Surpasses libyaml on 652Z and HM87/01. Port score
290 -> 292.
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| Decoding | ||
| Emitting | ||
| Encoding | ||
| Model | ||
| Parsing | ||
| Stream | ||
| Tagged | ||
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| API.swift | ||
| PureYAML.swift | ||