Add a build decoder for u64s with a default

This will fix `ReadState`s failing to decode a `mention_count` if it is
not present, as it may be optional. Default to `0`.

2 files changed, 6 insertions, 1 deletions

diff --git a/build.rs b/build.rs
index 2ab0961..de4cbe0 100644
--- a/build.rs
+++ b/build.rs
@@ -361,6 +361,11 @@ impl {0} {{
                             from,
                             default.parse::<u64>().unwrap())
                 },
+                ("u64", false, false, Some(default), None, None, None) => {
+                    format!(r#"try!(opt(&mut map, "{}", |v| Ok(req!(v.as_u64())))).unwrap_or({})"#,
+                            field_name,
+                            default.parse::<u64>().unwrap())
+                },
                 ("u64", false, false, None, None, Some(from), None) => {
                     format!(r#"req!(try!(remove(&mut map, "{}")).as_u64())"#,
                             from)
diff --git a/definitions/structs/read_state.yml b/definitions/structs/read_state.yml
index 3e0c8cd..ef580b6 100644
--- a/definitions/structs/read_state.yml
+++ b/definitions/structs/read_state.yml
@@ -11,5 +11,5 @@ fields:
     optional: true
     type: string
   - name: mention_count
-    default: 0
+    default: '0'
     type: u64