feat: add PeekKeys and PeekTrailerKeys (#1405)

* feat: add PeekKeys and PeekTrailerKeys

* Improve warning

Co-authored-by: Erik Dubbelboer <erik@dubbelboer.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/args.go b/args.go
index 47a97c6..92e5d5a 100644
--- a/args.go
+++ b/args.go
@@ -633,3 +633,11 @@ func peekAllArgBytesToDst(dst [][]byte, h []argsKV, k []byte) [][]byte {
 	}
 	return dst
 }
+
+func peekArgsKeys(dst [][]byte, h []argsKV) [][]byte {
+	for i, n := 0, len(h); i < n; i++ {
+		kv := &h[i]
+		dst = append(dst, kv.key)
+	}
+	return dst
+}