Use tagged pointer to represent size/length values (#769) #2477

Job	Run time
Build Benchmarks (w/ yoga)	53s
Build Benchmarks	34s
Build [debug feature]	6s
Build Examples	32s
MSRV Build [Rust 1.83]	12s
Clippy	39s
Documentation	20s
Test Fixture Formatting	9s
Rustfmt	7s
Markdown Lint	3s
Test Suite [alloc + all algorithms]	1m 16s
Test Suite [std + block)]	59s
Test Suite [default features]	52s
Test Suite [default except content_size]	55s
Test Suite [std + flexbox]	55s
Test Suite [default + serde]	57s
Test Suite [std + flexbox + detailed_layout_info]	1m 9s
Test Suite [std + grid]	1m 2s
Test Suite [std + grid + detailed_layout_info]	56s
Test Suite [alloc + no algorithms]	1m 5s
Test Suite [std (no algorithms)]	57s
Test Suite [no features]	1m 14s
	15m 52s

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