demo string-extraction of an array

Ref https://gitlab.com/uplex/varnish/libvmod-frozen/issues/1

src/vtc/vmod_frozen.vtc

@@ -17,6 +17,10 @@ varnish v1 -vcl+backend {
 	p_test.expect(".e");
 	p_test.expect(".f[0]");
 	p_test.expect(".f[1]");
+
+	# implementation detail: matching the array after it is complete
+	# is most efficient
+	p_test.expect(".f");
 	p_test.expect(".g.1");
 	p_test.expect(".g.h[0]");
     }
@@ -48,6 +52,11 @@ varnish v1 -vcl+backend {
 	set resp.http.f1 = p_test.extract(".f[1]");
 	set resp.http.f1-type = p_test.type(".f[1]");
 
+	# implementation detail: matching the array after it is complete
+	# is most efficient
+	set resp.http.f = p_test.extract(".f");
+	set resp.http.f-type = p_test.type(".f");
+
 	set resp.http.g1 = p_test.extract({".g.1"});
 	set resp.http.g1-type = p_test.type({".g.1"});
 
@@ -75,6 +84,8 @@ client c1 {
 	expect resp.http.f0-type == NUMBER
 	expect resp.http.f1 == -2
 	expect resp.http.f1-type == NUMBER
+	expect resp.http.f == "[ 1, -2, 3]"
+	expect resp.http.f-type == ARRAY
 	expect resp.http.g1 == "[]"
 	expect resp.http.g1-type == ARRAY
 	expect resp.http.gh0 == 7