fix(forms): support reserved control identifiers

Normalize raw Rust identifiers when matching generated form contracts so reserved HTML control names remain usable.

req: form/004

hemx-build/src/lib.rs

@@ -1260,13 +1260,16 @@ fn __hemx_attr(tag: &str, attr: &str) -> Option<::std::string::String> {
             out.push_str(&format!("handle_form\t{handle_ident}\t{form_ident}\n"));
         }
         for form in self.forms.values() {
+            let mut fields = BTreeMap::<&str, (bool, bool)>::new();
             for control in &form.controls {
+                let field = fields.entry(&control.name).or_default();
+                field.0 |= control.required;
+                field.1 |= form_control_is_multiple(&control.kind);
+            }
+            for (name, (required, multiple)) in fields {
                 out.push_str(&format!(
-                    "form_field\t{}\t{}\t{}\t{}\n",
-                    form.resource.ident,
-                    control.name,
-                    control.required,
-                    form_control_is_multiple(&control.kind)
+                    "form_field\t{}\t{name}\t{required}\t{multiple}\n",
+                    form.resource.ident
                 ));
             }
         }
@@ -2594,6 +2597,7 @@ mod tests {
             r#"<form data-hemx-handle="save" data-hemx-form="profile">
                 <input type="hidden" name="__h" value="123">
                 <input name="title" required>
+                <template h-if="alternate"><input name="title"></template>
                 <input name="count" type="number" min="1" max="10" step="1">
                 <select name="labels" multiple></select>
                 <input name="avatar" type="file">
@@ -2622,7 +2626,12 @@ mod tests {
         let syms = std::fs::read_to_string(out.join("hemx.syms")).unwrap();
         assert!(syms.contains("handle_form\tsave\tprofile\n"));
         assert!(!syms.contains("form_field\tprofile\t__h\t"));
-        assert!(syms.contains("form_field\tprofile\ttitle\ttrue\tfalse\n"));
+        assert_eq!(
+            syms.matches("form_field\tprofile\ttitle\ttrue\tfalse\n")
+                .count(),
+            1,
+            "conditional controls with one submitted name are one Rust form field"
+        ); // req: form/004 test
         assert!(syms.contains("form_field\tprofile\tlabels\tfalse\ttrue\n"));
 
         let _ = std::fs::remove_dir_all(&base);