[matmen]

The 4.0 line: everything 3.x deprecated is removed, the API takes options objects, and sixteen behaviors change.
master (3.20.3) is merged in, so this merges cleanly. A draft until 4.0.0.

• Release candidate: 4.0.0-rc.4 (npm tag rc, JSR)
• Migration guide
• CHANGELOG, 4.0.0 section

Before 4.0.0:

• feedback on rc.4
• the README's migration link points at master
• 3.x maintenance branch cut from 3.20.3
• docs site switched

[github-actions]

Test coverage

Compared with master where the branch left it (07dcf8d).

	Lines	Branches	Functions
total	97.8%	90.4% (+0.2)	98.2% (+0.1)
src/codecs/av1/decode.ts (141 lines untested)	91.7%	84.0%	97.9%
src/render/svg.ts (118 lines untested)	97.1% (+0.1)	89.6% (+0.5)	98.1% (-0.4)
src/render/layout.ts (105 lines untested)	93.6%	87.4% (+0.1)	95.7%
src/render/shape.ts (79 lines untested)	92.3%	87.3%	98.1%
src/codecs/jxl/headers.ts (62 lines untested)	87.0%	70.8%	86.4%
src/image.ts (50 lines untested)	98.5% (-0.6)	93.4% (-0.9)	98.4% (+0.5)
src/codecs/av1/obu.ts (43 lines untested)	93.0%	73.9%	92.8%
src/codecs/jxl/modular.ts (43 lines untested)	94.5%	82.7%	100.0%
src/codecs/jxl/fast-lossless.ts (37 lines untested)	94.9%	97.8%	93.0%
src/codecs/av1/frame.ts (35 lines untested)	73.1%	33.3%	100.0%

Changed

	Lines	Branches	Functions
src/gif.ts (removed)
src/version.ts (removed)
src/animation-encoder.ts	100.0% (+2.2)	97.7% (+1.5)	95.0% (-0.2)
src/util/resample.ts	97.1% (+2.1)	97.9% (+0.6)	100.0%
src/text-layout.ts	100.0% (+1.2)	100.0% (+17.9)	100.0%
src/frame.ts	100.0% (+1.1)	97.9% (+4.5)	100.0% (+11.8)
src/animation.ts	99.2% (+0.7)	90.9% (-3.2)	100.0% (+3.3)
src/colors.ts	98.5% (-0.6)	92.4% (+4.5)	93.8% (+0.9)
src/codecs/webp.ts	98.2% (+0.6)	87.1% (+3.0)	100.0%
src/image.ts	98.5% (-0.6)	93.4% (-0.9)	98.4% (+0.5)
src/render/svg-text.ts	98.6% (+0.2)	86.3% (+0.3)	100.0%
src/render/svg.ts	97.1% (+0.1)	89.6% (+0.5)	98.1% (-0.4)