Implement values with multiple units. #97
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Progress: 3371 of 5945 tests passed in dart-sass compatibility mode. ### Breaking changes * The unit of a `Numeric` is now a `UnitSet` rather than a `Unit`. * `Error` has new variants and a new field in `BadArguments`. * A sass::Value::Call now has a source position. * A `Rational` is now a `Ratio<i64>` rather than a `Ratio<isize>`. ### Improvements * Added a Contributing section to readme. * Handle values with multiple units. PR #97. * Show call position for errors in function calls, and test for type errors in many standard functions. Many error messages are made identical to dart-sass, improving test-suit progress with more than 400 tests. PR #99. * Fix issue #98: overflow in rational number arithmetic. * Allow `@at-root` at document root. * Boolean operators is truly lazy, e.g. `false and f($x)` does not call `f`. * Refactored number parsing to use overflowing rationals. PR #100. * Test suite sass-spec updated to 2021-03-02. * Updated num-rational and num-bigint to 0.4.0. Thanks to @alvra for reporting #98. Tested with rustc 1.50.0 (cb75ad5db 2021-02-10), rustc 1.48.0 (7eac88abb 2020-11-16), rustc 1.46.0 (04488afe3 2020-08-24), rustc 1.44.1 (c7087fe00 2020-06-17), rustc 1.51.0-beta.6 (6a1835ad7 2021-03-12), and rustc 1.52.0-nightly (acca81892 2021-03-13).
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This makes e.g.
abs(-7px / 4em) * 1emevaluate correctly, to1.75px.Also correct the
dpi/dpcm/dppxconversion factors, which were bogus.