Output frontmatter id as integer

src/frontmatter.js

@@ -34,9 +34,9 @@ export function excerpt(post) {
 	return post.data.encoded[1].replace(/[\r\n]+/gm, ' ');
 }
 
-// get ID
+// get ID, as an integer
 export function id(post) {
-	return post.data.post_id[0];
+	return parseInt(post.id);
 }
 
 // get slug, previously decoded and set on post
@@ -65,5 +65,5 @@ export function title(post) {
 // get type, often this will always be "post"
 // but can also be "page" or other custom types
 export function type(post) {
-	return post.data.post_type[0];
+	return post.type;
 }

src/parser.js

@@ -74,7 +74,7 @@ function collectPosts(channelData, postTypes) {
 
 function buildPost(data, turndownService) {
 	return {
-		// full raw post data, used by some frontmatter getters
+		// full raw post data
 		data,
 
 		// contents of the post in markdown

src/writer.js

@@ -83,6 +83,9 @@ async function loadMarkdownFilePromise(post) {
 				// array of one or more strings
 				outputValue = value.reduce((list, item) => `${list}\n  - "${item}"`, '');
 			}
+		} else if (Number.isInteger(value)) {
+			// output unquoted
+			outputValue = value.toString();
 		} else if (value instanceof luxon.DateTime) {
 			if (shared.config.customDateFormatting) {
 				outputValue = value.toFormat(shared.config.customDateFormatting);