Move pagination to its own package.
diff --git a/pagination/null.go b/pagination/null.go
new file mode 100644
index 0000000..ae57e18
--- /dev/null
+++ b/pagination/null.go
@@ -0,0 +1,20 @@
+package pagination
+
+// nullPage is an always-empty page that trivially satisfies all Page interfacts.
+// It's useful to be returned along with an error.
+type nullPage struct{}
+
+// NextPageURL always returns "" to indicate that there are no more pages to return.
+func (p nullPage) NextPageURL() (string, error) {
+ return "", nil
+}
+
+// IsEmpty always returns true to prevent iteration over nullPages.
+func (p nullPage) IsEmpty() (bool, error) {
+ return true, nil
+}
+
+// LastMark always returns "" because the nullPage contains no items to have a mark.
+func (p nullPage) LastMark() (string, error) {
+ return "", nil
+}