// current versionzw := lz4.NewWriter(w)zw.Header.HighCompression = true// new versionzw := lz4.NewWriter(w)zw.Header.CompressionLevel = CompressionLevel// where CompressionLevel is derived from a global var which may be setvar CompressionLevel int// compression.gofunc init()  {viper.BindEnv("LZ4_COMPRESSION_LEVEL")viper.SetDefault("LZ4_COMPRESSION_LEVEL", 40)CompressionLevel = viper.GetInt("LZ4_COMPRESSION_LEVEL")}

--- FAIL: TestFuzz (0.98s)    writer_test.go:270: maxVal 92765; maxBuffer 26264139; seed 1539774761052879507panic: Read 4194304 bytes but expected 26221599 [recovered]        panic: Read 4194304 bytes but expected 26221599goroutine 6 [running]:testing.tRunner.func1(0xc0000e8200)        /usr/local/go1.11.1.linux-amd64/src/testing/testing.go:792 +0x387panic(0x8760e0, 0xc0000921c0)        /usr/local/go1.11.1.linux-amd64/src/runtime/panic.go:513 +0x1b9log.Panicf(0x921509, 0x1d, 0xc00088da28, 0x2, 0x2)        /usr/local/go1.11.1.linux-amd64/src/log/log.go:333 +0xdagithub.com/carapace/cellar.loadChunkIntoBuffer(0xc0000a2300, 0x2d, 0xc0009d0080, 0x10, 0x10, 0x1901c1f, 0xc004d04000, 0x1901c1f, 0x1901c1f, 0x0, ...)        /home/karel/go/src/github.com/abdullin/cellar/reader.go:283 +0x484github.com/carapace/cellar.(*Reader).Scan(0xc00088def0, 0xc00088de68, 0x0, 0x0)        /home/karel/go/src/github.com/abdullin/cellar/reader.go:135 +0x4bagithub.com/carapace/cellar.TestFuzz(0xc0000e8200)        /home/karel/go/src/github.com/abdullin/cellar/writer_test.go:311 +0x3e5testing.tRunner(0xc0000e8200, 0x9330a0)        /usr/local/go1.11.1.linux-amd64/src/testing/testing.go:827 +0xbfcreated by testing.(*T).Run        /usr/local/go1.11.1.linux-amd64/src/testing/testing.go:878 +0x353FAIL    github.com/carapace/cellar      1.205s

--- FAIL: TestFuzz (0.00s)    writer_test.go:270: maxVal 110817; maxBuffer 30725211; seed 1539774415500550257panic: runtime error: index out of range [recovered]        panic: runtime error: index out of rangegoroutine 8 [running]:testing.tRunner.func1(0xc0000ce200)        /usr/local/go1.11.1.linux-amd64/src/testing/testing.go:792 +0x387panic(0x8a2480, 0xe88f90)        /usr/local/go1.11.1.linux-amd64/src/runtime/panic.go:513 +0x1b9github.com/carapace/cellar.TestFuzz(0xc0000ce200)        /home/karel/go/src/github.com/abdullin/cellar/writer_test.go:297 +0xb28testing.tRunner(0xc0000ce200, 0x9330a0)        /usr/local/go1.11.1.linux-amd64/src/testing/testing.go:827 +0xbfcreated by testing.(*T).Run        /usr/local/go1.11.1.linux-amd64/src/testing/testing.go:878 +0x353FAIL    github.com/carapace/cellar      0.193s