Don't support Go older than 1.20

Author: lfittl

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: ['1.14', '1.15', '1.16', '1.17', '1.18', '1.19', '1.20', '1.21']
+        go: ['1.20', '1.21']
         os: ['ubuntu-latest', 'windows-latest']
         include:
         - go: 1.16 # Oldest Go version still tested (Windows requires 1.20+ due to https://github.com/golang/go/issues/57455)

parser/string_to_bytes.go

@@ -1,19 +1,14 @@
-//go:build !go1.20
-// +build !go1.20
+//go:build go1.20
+// +build go1.20
 
 package parser
 
-import (
-	"reflect"
-	"unsafe"
-)
+import "unsafe"
 
 func toBytes(s string) (b []byte) {
-	pb := (*reflect.SliceHeader)(unsafe.Pointer(&b))
-	ps := (*reflect.StringHeader)(unsafe.Pointer(&s))
-	pb.Data = ps.Data
-	pb.Len = ps.Len
-	pb.Cap = ps.Len
-
-	return b
+	if s == "" {
+		return nil
+	}
+	
+	return unsafe.Slice(unsafe.StringData(s), len(s))
 }