[experiment] reduce prop edge cases

[developit]

This uses a technique from Preact 8.

[github-actions[bot]]

Size Change: -28 B (0%)

Total Size: 40.9 kB

Filename	Size	Change
dist/preact.js	3.96 kB	-9 B (0%)
dist/preact.min.js	3.99 kB	-5 B (0%)
dist/preact.module.js	3.98 kB	-6 B (0%)
dist/preact.umd.js	4.02 kB	-8 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
compat/dist/compat.js	3.38 kB	0 B
compat/dist/compat.module.js	3.4 kB	0 B
compat/dist/compat.umd.js	3.44 kB	0 B
debug/dist/debug.js	3.06 kB	0 B
debug/dist/debug.module.js	3.06 kB	0 B
debug/dist/debug.umd.js	3.15 kB	0 B
devtools/dist/devtools.js	185 B	0 B
devtools/dist/devtools.module.js	195 B	0 B
devtools/dist/devtools.umd.js	260 B	0 B
hooks/dist/hooks.js	1.09 kB	0 B
hooks/dist/hooks.module.js	1.11 kB	0 B
hooks/dist/hooks.umd.js	1.17 kB	0 B
test-utils/dist/testUtils.js	437 B	0 B
test-utils/dist/testUtils.module.js	439 B	0 B
test-utils/dist/testUtils.umd.js	515 B	0 B

_{compressed-size-action}

[coveralls]

Coverage decreased (-0.8%) to 99.031% when pulling 0d5420befa1b2e3adc509e8379991d7a22880724 on reduce-prop-edge-cases into 45fa7cfa1f9bcf0a9467b49420813d07e95a9061 on master.