Make Get operations only serialize the bare minimum.

service/datastore/properties.go

Index: service/datastore/properties.go
diff --git a/service/datastore/properties.go b/service/datastore/properties.go
index d42c098b0ff4c618fe2e271f2e9ba39775b4b861..473269fc92dce5b7400f9a582590c9ef345a89ee 100644
--- a/service/datastore/properties.go
+++ b/service/datastore/properties.go
@@ -680,6 +680,11 @@ type PropertyLoadSaver interface {
 
 	MetaGetter
 
+	// GetAllMeta returns a PropertyMap with all of the metadata in this
+	// PropertyLoadSaver. If a metadata field has an error during serialization,
+	// it is skipped.
+	GetAllMeta() PropertyMap
+
 	// SetMeta allows you to set the current value of the meta-keyed field.
 	SetMeta(key string, val interface{}) error
 
@@ -753,6 +758,19 @@ func (pm PropertyMap) GetMeta(key string) (interface{}, error) {
 	return v[0].Value(), nil
 }
 
+// GetAllMeta implements PropertyLoadSaver.GetAllMeta.
+func (pm PropertyMap) GetAllMeta() PropertyMap {
+	ret := make(PropertyMap, 8)
+	for k, v := range pm {
+		if isMetaKey(k) {
+			newV := make([]Property, len(v))
+			copy(newV, v)
+			ret[k] = newV
+		}
+	}
+	return ret
+}
+
 // GetMetaDefault is the implementation of PropertyLoadSaver.GetMetaDefault.
 func (pm PropertyMap) GetMetaDefault(key string, dflt interface{}) interface{} {
 	return GetMetaDefaultImpl(pm.GetMeta, key, dflt)