improve webidl.is.x performance for common case #14903

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Total Tests: 1016 Suites 📂: 78 Passed ✅: 1011 Failed ❌: 0 Canceled 🚫: 0 Skipped ⏭️: 5 Todo 📝: 0 Duration 🕐: 28290.695ms

Total Tests: 189 Suites 📂: 6 Passed ✅: 176 Failed ❌: 0 Canceled 🚫: 0 Skipped ⏭️: 13 Todo 📝: 0 Duration 🕐: 3022.180ms

Total Tests: 3 Suites 📂: 0 Passed ✅: 3 Failed ❌: 0 Canceled 🚫: 0 Skipped ⏭️: 0 Todo 📝: 0 Duration 🕐: 116.275ms

Total Tests: 100 Suites 📂: 0 Passed ✅: 100 Failed ❌: 0 Canceled 🚫: 0 Skipped ⏭️: 0 Todo 📝: 0 Duration 🕐: 6325.633ms

Total Tests: 369 Suites 📂: 14 Passed ✅: 369 Failed ❌: 0 Canceled 🚫: 0 Skipped ⏭️: 0 Todo 📝: 0 Duration 🕐: 33757.859ms

Total Tests: 22 Suites 📂: 4 Passed ✅: 22 Failed ❌: 0 Canceled 🚫: 0 Skipped ⏭️: 0 Todo 📝: 0 Duration 🕐: 152.180ms

Total Tests: 2 Suites 📂: 1 Passed ✅: 2 Failed ❌: 0 Canceled 🚫: 0 Skipped ⏭️: 0 Todo 📝: 0 Duration 🕐: 191.661ms

Total Tests: 66 Suites 📂: 7 Passed ✅: 66 Failed ❌: 0 Canceled 🚫: 0 Skipped ⏭️: 0 Todo 📝: 0 Duration 🕐: 1519.611ms

Total Tests: 95 Suites 📂: 16 Passed ✅: 95 Failed ❌: 0 Canceled 🚫: 0 Skipped ⏭️: 0 Todo 📝: 0 Duration 🕐: 10962.403ms

Total Tests: 77 Suites 📂: 12 Passed ✅: 77 Failed ❌: 0 Canceled 🚫: 0 Skipped ⏭️: 0 Todo 📝: 0 Duration 🕐: 4102.885ms