v0.2.16

• PATCH: new optional exports and fields, with no break (L57). The packing engine found the 3 shape gaps when it packed shapes by their bounding boxes.
• The new exports are regionArea, boxArea, ruleLevel, RuleLevel, shapeSupportProblems and ShapeCheck.
• The new optional fields are ShapeSupport.safe, MemberRule.view and CorpusDimension.precision. checkShapes has a new optional third parameter options.
• regionArea gives the exact area of a region. A polygon uses the shoelace formula, less its holes. SHAPE_KINDS gives geometry.area to polygon and circle.
• boxArea gives the area of a box, or undefined for a free box. A box with an ellipse shape is free, so it gives undefined.
• safe lists the kinds with a safe count. no-overlap and in-container of PACK_HARD_RULES are safe on polygon, circle and free.
• checkShapes refuses a safe kind by default, as before. Its break also tells that the count is only safe. With { level: "safe" }, it accepts the kind.
• shapeSupportProblems refuses a kind in shapes and in safe, an unknown kind and a repeated kind.
• With view: "bounds", a meta option gives its members the bounding box of each item. A shape filter then checks the members with rect.
• With view: "bounds", checkConfig, spaceSize, enumerateSpace and the pool entries use rect for the members. checkSpace refuses another view.
• precision rounds a numeric value and its default before the invalidates compare. A margin of 0.0004 with precision: 3 keeps known.
• precision changes only that compare. The registry, sharedDimension and ownerDimension refuse a bad precision, and precision on a dimension that is not numeric.
• Each input, manifest, record, hash and configId of 0.2.15 stays the same.