in PR pkg/28745.
Changes since 0.9.0 include:
* Bugs concerning `trace' command and `triangle' function fixed.
* Strings may now be enclosed in dollar signs ($).
* Variable names may now contain underscores (_) and single quotes (').
* New `strokes' command.
* New `label' command.
* Enhancement of `arg' function.
* Enhancement of `draw' command.
* New `dot' angle mark.
* Various new numerical functions: `min', `max', `clamp', `sign', `ceil',
`floor', `round'.
* New ternary test operator, logical operators and comparison operators.
* Improvement of `interactive' command.
* Improvement of triangle and quadrilateral assignments.
* Minor bug fixes.
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