fix: change taproot descriptor output format to array

Change Tr descriptor output from object to array format to match test fixtures.
Internal key and tap tree are now returned as array elements.

Issue: BTC-1829

Author: OttoAllmendinger

packages/wasm-miniscript/src/try_into_js_value.rs

@@ -208,10 +208,7 @@ impl<Pk: MiniscriptKey + TryIntoJsValue> TryIntoJsValue for WshInner<Pk> {
 
 impl<Pk: MiniscriptKey + TryIntoJsValue> TryIntoJsValue for Tr<Pk> {
     fn try_to_js_value(&self) -> Result<JsValue, JsError> {
-        js_obj!(
-            "internalKey" => self.internal_key(),
-            "tree" => self.tap_tree()
-        )
+        Ok(js_arr!(self.internal_key(), self.tap_tree()))
     }
 }
 

packages/wasm-miniscript/test/fixtures/58.json

@@ -1,11 +1,11 @@
 {
   "descriptor": "tr(50929b74c1a04954b78b4b6035e97a5e078a5a0f28ec96d547bfee9ace803ac0,multi_a(2,xpub661MyMwAqRbcFXS2qwsTkaFc7PEpwDXWgY1Hx2MS7XywhW24sTjQzxiUgnGNW5v6DsW9Z8JcAqf8a22v21jDSA3DwLbbpt2ra3WbP83QNvP/0/0,xpub661MyMwAqRbcGfiaWcoeKLerFu3qRfy6zSYAwnmxSKW8JSauRajFsAsRHs2pV4q5rxkb4ynx4Bm8t54McTCp8V27s7XsdpD8T4s56etpjro/0/0,xpub661MyMwAqRbcH4HzWiCwmYajy1SXZngxHvpYDNEX4xjrDAneAm6rnpPuPPXcBRsSgxupDBmH2tzPHkikNrnLbsvTHemPFHSFbZxonZcCwFi/0/0))#82q34xv2",
   "ast": {
-    "Tr": {
-      "internalKey": {
+    "Tr": [
+      {
         "Single": "50929b74c1a04954b78b4b6035e97a5e078a5a0f28ec96d547bfee9ace803ac0"
       },
-      "tree": {
+      {
         "MultiA": [
           2,
           {
@@ -19,6 +19,6 @@
           }
         ]
       }
-    }
+    ]
   }
 }