fix(compiler-core): support interpolation in RCDATA mode (e.g. textarea)

packages/compiler-core/src/parse.ts

@@ -111,11 +111,11 @@ function parseChildren(
     const s = context.source
     let node: TemplateChildNode | TemplateChildNode[] | undefined = undefined
 
-    if (mode === TextModes.DATA) {
+    if (mode === TextModes.DATA || mode === TextModes.RCDATA) {
       if (!context.inPre && startsWith(s, context.options.delimiters[0])) {
         // '{{'
         node = parseInterpolation(context, mode)
-      } else if (s[0] === '<') {
+      } else if (mode === TextModes.DATA && s[0] === '<') {
         // https://html.spec.whatwg.org/multipage/parsing.html#tag-open-state
         if (s.length === 1) {
           emitError(context, ErrorCodes.EOF_BEFORE_TAG_NAME, 1)