Extend hcl2 support with more functions

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

vendor/github.com/zclconf/go-cty/cty/convert/mismatch_msg.go

@@ -78,10 +78,16 @@ func mismatchMessageObjects(got, want cty.Type) string {
 	for name, wantAty := range wantAtys {
 		gotAty, exists := gotAtys[name]
 		if !exists {
-			missingAttrs = append(missingAttrs, name)
+			if !want.AttributeOptional(name) {
+				missingAttrs = append(missingAttrs, name)
+			}
 			continue
 		}
 
+		if gotAty.Equals(wantAty) {
+			continue // exact match, so no problem
+		}
+
 		// We'll now try to convert these attributes in isolation and
 		// see if we have a nested conversion error to report.
 		// We'll try an unsafe conversion first, and then fall back on