v4.0.0

Breaking

• Ships as a native ES module. A low-baseline ES5 UMD bundle is still available, but not a package entry point.
• Renamed supported to isSupported (named ESM export).
• Replaced the options object with a single boolean argument: isSupported(failIfMajorPerformanceCaveat).
• webGLContextAttributes is now a top-level named export instead of a property on the function.

Fixed

• No longer falsely reports unsupported under strict Content Security Policy (#42).

Improved

• Added an Object.hasOwn runtime check, matching the current Mapbox GL JS support matrix.
• 33% smaller min+gzip bundle (1001 B → 674 B).
• First-class TypeScript types (generated from JSDoc).