v2.6.1

• Do not strip :00 seconds from !!timestamp values (#578, with thanks to @qraynaud)
• Tighten regexp for JSON !!bool (#587, with thanks to @vra5107)
• Default to literal block scalar if folded would overflow (#585)

v2.6.0

• Use a proper tag for !!merge << keys (#580)
• Add stringKeys parse option (#581)
• Stringify a Document as a Document (#576)
• Add sponsorship by Manifest

v2.5.1

• Include range in flow sequence pair maps (#573)

v2.5.0

• Add --indent option to CLI tool (#559, with thanks to @danielbayley)
• Require newline in all cases for props on block sequence (#557)
• Always reset indentation in lexer on ... (#558)
• Ignore minContentWidth if greater than lineWidth (#562)
• Drop unused Collection.maxFlowStringSingleLineLength (#522, #421)

v2.4.5

• Improve tab handling (#553, yaml-test-suite tests DK95 & Y79Y)

v2.4.4

With special thanks to @RedCMD for finding and reporting all of the following:

• Allow comment after top-level block scalar with explicit indent indicator (#547)
• Allow tab as indent for line comments before nodes (#548)
• Do not allow tab before block collection (#549)
• In flow collections, allow []{} immediately after : with plain key (#550)
• Require indentation for ? explicit-key contents (#551)
• Require indentation from block scalar header & flow collections in mapping values (#553)

v2.4.3

• Improve error when parsing a non-string value (#459)
• Do not parse -.NaN or +.nan as NaN (#546)
• Support # within %TAG prefixes with trailing #comments
• Check for non-node complex keys when stringifying with simpleKeys (#541)

v2.4.2

• Restrict YAML 1.1 boolean strings to their explicit capitalization (#530)
• Add sponsorship by Scipress (#536)

v2.4.1

• cst: Do not drop trailing newline after line comment in block-map if followed by unindented block-seq value (#525)
• Stringify flow collection comments in parent (#528)
• Do not skip folding lines after the first in indented block scalars (#529)

v2.4.0

• Add a command-line tool (#523)
• Use the lineWidth option for line breaking in flow collections (#522)