Add skip-method proposed by Morita et al. (2001)
diff --git a/datokenizer_test.go b/datokenizer_test.go
index c6b6c8e..62df4c7 100644
--- a/datokenizer_test.go
+++ b/datokenizer_test.go
@@ -983,3 +983,7 @@
// BenchmarkTransduce-4 39966 30835 ns/op 8240 B/op 3 allocs/op
// BenchmarkToDoubleArray-4 50720 24863 ns/op 11091 B/op 46 allocs/op
// BenchmarkToDoubleArrayLarger-4 3 432523828 ns/op 6413381 B/op 5122 allocs/op
+// 2021-09-02 - xCheckSkip() with .9
+// BenchmarkTransduce-4 36325 38501 ns/op 8240 B/op 3 allocs/op
+// BenchmarkToDoubleArray-4 66858 19286 ns/op 10607 B/op 29 allocs/op
+// BenchmarkToDoubleArrayLarger-4 18 67428011 ns/op 6360604 B/op 2578 allocs/op