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The blend, envelope and gradient mesh commands read their optional
numbers with f64_or or as_f64, which fall back to a default for a value
that is not a JSON number. object.blend.make {"steps": "8"} made a
Smooth Color blend and reported success. Blend Options did the same
with steps, distance and value. Make with Warp, Reset with Warp and
Envelope Options did the same with bend, h and v (and their long
names). Make with Mesh, Reset with Mesh and Create Gradient Mesh did
the same with rows, cols and columns. Envelope Options did the same
with fidelity, Create Gradient Mesh did the same with highlight, and
Set Mesh Point Color did the same with opacity.
These commands now fail with "`<key>` must be a number, not <value>"
for a value that is not a number or null, as the transform commands
do, and change nothing. Envelope Options refuses the warp keys whether
or not a warp envelope is selected. Create Gradient Mesh refuses an
`at` that is not exactly two numbers with "`at` must be [x, y]".
Before, it took the first two entries of a longer array, and for any
other value it made a mesh with no lines through the point.
Docs: docs/mcp.md, docs/target-app-parity.md.