Add $whiteness and $blackness parameters to color.adjust(), color.change(), and color.scale() to modify a color's HWB whiteness and blackness components.

Dart API

Add HWB support to the SassColor class, including a SassColor.hwb() constructor, whiteness and blackness getters, and a changeHwb() method.

`v1.27.2`

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No user-visible changes.

`v1.27.1`

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Potentially breaking bug fix: meta.load-css() now correctly uses the name $url for its first argument, rather than $module.
Don't crash when using Infinity or NaN as a key in a map.
Emit a proper parse error for a = with no right-hand side in a function.
Avoid going exponential on certain recursive @extend edge cases.

`v1.27.0`

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Adds an overload to map.merge() that supports merging a nested map.

map.merge($map1, $keys..., $map2): The $keys form a path to the nested map in $map1, into which $map2 gets merged.

See [the Sass documentation][map-merge] for more details.

[map-merge]: https://sass-lang.com/documentation/modules/map#merge
Adds an overloaded map.set() function.

map.set($map, $key, $value): Adds to or updates $map with the specified $key and $value.

map.set($map, $keys..., $value): Adds to or updates a map that is nested within $map. The $keys form a path to the nested map in $map, into which $value is inserted.

See [the Sass documentation][map-set] for more details.

[map-set]: https://sass-lang.com/documentation/modules/map#set
Add support for nested maps to map.get(). For example, map.get((a: (b: (c: d))), a, b, c) would return d. See [the documentation][map-get] for more details.

[map-get]: https://sass-lang.com/documentation/modules/map#get
Add support for nested maps in map.has-key. For example, map.has-key((a: (b: (c: d))), a, b, c) would return true. See [the documentation][map-has-key] for more details.

[map-has-key]: https://sass-lang.com/documentation/modules/map#has-key
Add a map.deep-merge() function. This works like map.merge(), except that nested map values are also recursively merged. For example:
```
map.deep-merge(
  (color: (primary: red, secondary: blue),
  (color: (secondary: teal)
) // => (color: (primary: red, secondary: teal))
```
See [the Sass documentation][map-deep-merge] for more details.

[map-deep-merge]: https://sass-lang.com/documentation/modules/map#deep-merge
Add a map.deep-remove() function. This allows you to remove keys from nested maps by passing multiple keys. For example:
```
map.deep-remove(
  (color: (primary: red, secondary: blue)),
  color, primary
) // => (color: (secondary: blue))
```
See [the Sass documentation][map-deep-remove] for more details.

[map-deep-remove]: https://sass-lang.com/documentation/modules/map#deep-remove
Fix a bug where custom property values in plain CSS were being parsed as normal property values.

Dart API

Add a Value.tryMap() function which returns the Value as a SassMap if it's a valid map, or null otherwise. This allows function authors to safely retrieve maps even if they're internally stored as empty lists, without having to catch exceptions from Value.assertMap().

`v1.26.12`

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Fix a bug where nesting properties beneath a Sass-syntax custom property (written as #{--foo}: ...) would crash.

`v1.26.11`

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Potentially breaking bug fix: selector.nest() now throws an error if the first arguments contains the parent selector &.
Fixes a parsing bug with inline comments in selectors.
Improve some error messages for edge-case parse failures.
Throw a proper error when the same built-in module is @used twice.
Don't crash when writing Infinity in JS mode.
Produce a better error message for positional arguments following named arguments.