fix: cast whole-number floats to int in argument validation

exampleSite/data/tests/casting.yml

@@ -51,3 +51,12 @@ cases:
     structure: test-cast
     args:
       items-list: [1, "two", true]
+  # Whole-number floats cast losslessly to int (JSON round-trips — e.g. frontmatter
+  # injected by CloudCannon's visual editor — deliver every number as float64).
+  - name: whole-float-to-int
+    structure: test-cast
+    args: {count: 42.0}
+  # Fractional floats still fail the int type check.
+  - name: fractional-float-to-int
+    structure: test-cast
+    args: {count: 42.5}

layouts/_partials/utilities/Args.html

@@ -133,6 +133,14 @@
                 {{ $value = float $value }}
                 {{ $kind = "float" }}
             {{ end }}
+        {{ else if and (eq $kind "float") (in $node.accepts "int") (not (in $node.accepts "float")) (eq (float (int $value)) (float $value)) }}
+            {{/* whole-number floats cast losslessly to int. Data that round-trips through
+                 JSON — notably page frontmatter injected by CloudCannon's visual editor
+                 (Bookshop live rendering) — arrives with every number as float64, so an
+                 int argument would otherwise reject values the YAML source declares as
+                 plain integers. Fractional values still fail the type check below. */}}
+            {{ $value = int $value }}
+            {{ $kind = "int" }}
         {{ else if and (in $node.accepts "string") (in (slice "bool" "int" "float") $kind) (not (in $node.accepts $kind)) }}
             {{ $value = string $value }}
             {{ $kind = "string" }}

tests/golden/casting.json

@@ -62,6 +62,27 @@
       ]
     }
   },
+  "fractional-float-to-int": {
+    "args": {
+      "args": {
+        "count": 42.5
+      },
+      "defaulted": [],
+      "err": true,
+      "errmsg": [
+        "[test-cast] argument 'count': expected type 'int', got 'float64' with value '42.5'"
+      ],
+      "warnmsg": []
+    },
+    "initargs": {
+      "default": [],
+      "err": true,
+      "errmsg": [
+        "[test-cast] argument 'count': expected type 'int', got 'float64' with value '42.5'"
+      ],
+      "warnmsg": []
+    }
+  },
   "generic-dict-as-map": {
     "args": {
       "args": {
@@ -233,6 +254,24 @@
       "warnmsg": []
     }
   },
+  "whole-float-to-int": {
+    "args": {
+      "args": {
+        "count": 42
+      },
+      "defaulted": [],
+      "err": false,
+      "errmsg": [],
+      "warnmsg": []
+    },
+    "initargs": {
+      "count": 42,
+      "default": [],
+      "err": false,
+      "errmsg": [],
+      "warnmsg": []
+    }
+  },
   "wrong-type-errors": {
     "args": {
       "args": {