v1.0.0

The first stable release. The public API is frozen under semantic versioning. Results are bit-identical to 0.1.0-preview.5: there is no numeric change.

From this release on, results are also bit-identical across every release of a major version: no 1.x minor or patch release changes an existing result (see "The determinism promise" in the README).

Changed (breaking since 0.1.0-preview.5)

One verb per concept: Create... builds a value from parts or another concept, From... is only a representation change, and instance methods that return a new value are participles. Numeric results are unchanged; only names move.

Before	Now
Matrix2x2/3x3/4x4 D/F .Transpose()	.Transposed()
QuaternionD/F .Conjugate()	.Conjugated()
RigidTransformD/F .Inverse()	.Inverted()
QuaternionD/F .FromAxisSinCos(axis, sin, cos)	.CreateFromAxisSinCos(axis, sin, cos)
QuaternionD/F .FromMatrix(m)	.CreateFromRotationMatrix(m)
Affine3D/F .FromTranslation(v)	.CreateTranslation(v)
Bounds2/3 D/F .FromPoints(points)	.CreateFromPoints(points)
Bounds2/3 D/F .FromCenterExtents(c, e)	.CreateFromCenterExtents(c, e)
FixedBridge.MaxMagnitude (const)	FixedBridge.ExclusiveMagnitudeBound (static property; the bound is exclusive)
PrincipalAxesD/F(moments, rotation, orientation)	PrincipalAxesD/F(moments, rotation); Orientation is derived from Rotation, so the two cannot disagree
MassPropertiesD/F(mass, ...) accepted a negative mass	throws ArgumentOutOfRangeException (parameter mass)

Also: the parameters of FromRows / FromColumns are now row0.. / column0.. (0-based, like Row(int) and Column(int)); ParamName of every argument exception names a parameter of the public method that was called (predicates: ax..ez; InertiaD/F.PrincipalAxes: tensor); all public value types serialize with System.Text.Json (public fields and component constructors, derived members ignored; bit-exact round trip with default options and with source-generated metadata); the package project URL points at the repository; the matrix convention (column vectors, the opposite of System.Numerics) and the predicate input range (out-of-range input may throw) are documented in the README, the package readme and the type and method docs.

Added

• QuaternionD/F: CreateFromAxisAngle (exactly CreateFromAxisSinCos(axis, SinCos(radians / 2))) and Slerp (shortest arc; evaluation order in docs/evaluation-order.md).
• Matrix3x3D/F: CreateRotationX/Y/Z, CreateFromQuaternion. Matrix4x4D/F: CreateRotationX/Y/Z, CreateFromQuaternion, CreateFromMatrix3x3, CreateFromAffine.
• Affine3D/F: CreateScale, CreateFromLinear, CreateFromQuaternion, CreateRotationX/Y/Z.
• FromSystemNumerics / ToSystemNumerics on Vector2/3/4, Quaternion and Matrix4x4 (D and F). The matrix conversions transpose; double to float rounds to nearest even.
• Hash-matrix scenarios types/f32/rotation, types/f64/rotation and types/json (a source-generated JSON round trip that also runs in the NativeAOT and WebAssembly smoke apps). Every earlier manifest line is unchanged.

Removed

• ExpansionArithmetic is no longer public. Its preconditions are not checked (invalid input gives silently wrong results), and publishing it would freeze Shewchuk's output-size rules. It remains the internal engine behind ExactPredicates and SegmentPredicates; exposing a checked form later would be an additive change.