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Introduce always-populated weight arrays in BSpline/Bezier curve and surface classes using non-owning views over a static unit-weights buffer. Migrate ~100 callers across the codebase from deprecated copy-out APIs to direct const-reference array access. Fix a long-standing typo bug in Hermit.cxx. Infrastructure (BSplCLib, BSplSLib): - Add BSplCLib::UnitWeights(n) returning a non-owning NCollection_Array1 view over a compile-time-initialized static array of 2049 ones; falls back to heap allocation for larger sizes. - Add BSplCLib::MaxUnitWeightsSize() (constexpr 2049) and BSplCLib::UnitWeightsData() exposing the raw pointer for BSplSLib. - Add BSplSLib::UnitWeights(nU, nV) returning a non-owning NCollection_Array2 view when nU*nV <= 2049, heap-allocated otherwise. Always-populated myWeights (Geom/Geom2d curve and surface classes): - myWeights is now always sized to match poles count. Non-rational: non-owning view via UnitWeights (zero allocation). Rational: owning array with actual weight values. - Add WeightsArray() returning const NCollection_Array1<double>& (curves) or const NCollection_Array2<double>& (surfaces) that is always valid. - Update all constructors, copy constructors, and restructuring operations (IncreaseDegree, InsertKnots, RemoveKnot, Segment, SetPeriodic, SetOrigin, SetNotPeriodic, ExchangeUV, etc.) to maintain the invariant. - SetWeight: copies non-owning view to owned array before mutation when transitioning to rational; assigns UnitWeights when becoming non-rational. - Remove myRational derivation from myWeights.Size() in updateKnots(); rationality is now tracked explicitly via the myRational flag only. - Fix Geom2d_BSplineCurve::InsertPoleAfter missing myRational update after inserting a weighted pole. - Fix Geom_BSplineCurve::DumpJson stale myWeights.Size() > 0 guard (changed to myRational, matching all other classes). Caller migration to direct array access (~100 files): - Replace deprecated copy-out pattern (allocate temp + call Foo(temp)) with const-reference access for Poles(), Knots(), Multiplicities(), UKnots(), VKnots(), UMultiplicities(), VMultiplicities(), KnotSequence(), UKnotSequence(), VKnotSequence(). - Replace Weights() null-pointer patterns with WeightsArray() const-ref or *Weights() dereference where null check is still appropriate. - Affected modules: GeomConvert, Geom2dConvert, GeomLib, GeomFill, ProjLib, ShapeUpgrade, ShapeCustom, ShapeConstruct, ShapeAnalysis, ShapeAlgo, BRepLib, BRepGProp, HLRBRep, ChFi3d, ChFiKPart, BlendFunc, FairCurve, IntTools, TopOpeBRepTool, TopOpeBRepBuild, LocOpe, BRepOffset, Adaptor3d, GeomAdaptor, Geom2dAdaptor, BndLib, Extrema, DrawTrSurf, GeometryTest, GeomliteTest, SWDRAW, QABugs, GeomToIGES, IGESToBRep, GeomToStep, StdPrs. Bug fix in Hermit.cxx (PolyTest, both 3D and 2D overloads): - Fix typo: "Pole0 < 3" changed to "Pole0 < Pole3" — was comparing a double variable against the integer literal 3 instead of the variable Pole3 holding the endpoint weight value. - Fix logic: "if (boucle == 1)" changed to "else if (boucle == 1)" to make the boucle==1 and boucle==2 branches mutually exclusive. - Add explanatory comments on BSplCLib::D1 calls that intentionally pass weight values as scalar "poles" to evaluate the weight function. NCollection_PackedMapAlgo migration (TDataStd, QABugs): - Replace deprecated member functions (IsSubset, Subtraction, Subtract, Unite, Intersect, IsEqual) with NCollection_PackedMapAlgo free functions. GTests: - New BSplCLib_Test.cxx: 5 tests for UnitWeights API. - New BSplSLib_Test.cxx: 5 tests for surface UnitWeights API. - New Hermit_Test.cxx: 11 tests for Hermit::Solution (3D/2D) and Hermit::Solutionbis covering uniform, distinct, high-ratio, reversed, symmetric weights and positive-poles invariant. - Add WeightsArray tests to Geom_BSplineCurve_Test, Geom_BezierCurve_Test, Geom_BSplineSurface_Test, Geom_BezierSurface_Test (2 tests each) verifying const-ref return, non-owning for non-rational, owning for rational.