diff --git a/pkg/argus_wasm.d.ts b/pkg/argus_wasm.d.ts
index 4aa98fe..6ae1681 100644
--- a/pkg/argus_wasm.d.ts
+++ b/pkg/argus_wasm.d.ts
@@ -1,39 +1,17 @@
 /* tslint:disable */
 /* eslint-disable */
-export function eval_boolean(s: string, trace: StateBuddyTrace): StateBuddyEvalResult;
-export class StateBuddyEvalResult {
-  private constructor();
-  free(): void;
-  [Symbol.dispose](): void;
-}
-export class StateBuddyEvalResultEntry {
-  private constructor();
-  free(): void;
-  [Symbol.dispose](): void;
-}
-export class StateBuddyTrace {
-  private constructor();
-  free(): void;
-  [Symbol.dispose](): void;
-}
-export class StateBuddyTraceEntry {
-  private constructor();
-  free(): void;
-  [Symbol.dispose](): void;
-}
+export function eval_boolean(s: string, js_trace: any): any;
 
 export type InitInput = RequestInfo | URL | Response | BufferSource | WebAssembly.Module;
 
 export interface InitOutput {
   readonly memory: WebAssembly.Memory;
-  readonly __wbg_statebuddytraceentry_free: (a: number, b: number) => void;
-  readonly __wbg_statebuddytrace_free: (a: number, b: number) => void;
-  readonly eval_boolean: (a: number, b: number, c: number) => number;
-  readonly __wbg_statebuddyevalresultentry_free: (a: number, b: number) => void;
-  readonly __wbg_statebuddyevalresult_free: (a: number, b: number) => void;
-  readonly __wbindgen_externrefs: WebAssembly.Table;
+  readonly eval_boolean: (a: number, b: number, c: any) => any;
   readonly __wbindgen_malloc: (a: number, b: number) => number;
   readonly __wbindgen_realloc: (a: number, b: number, c: number, d: number) => number;
+  readonly __wbindgen_exn_store: (a: number) => void;
+  readonly __externref_table_alloc: () => number;
+  readonly __wbindgen_externrefs: WebAssembly.Table;
   readonly __wbindgen_start: () => void;
 }
 
diff --git a/pkg/argus_wasm.js b/pkg/argus_wasm.js
index e9accae..8cc58dd 100644
--- a/pkg/argus_wasm.js
+++ b/pkg/argus_wasm.js
@@ -30,6 +30,75 @@ function getStringFromWasm0(ptr, len) {
     return decodeText(ptr, len);
 }
 
+function isLikeNone(x) {
+    return x === undefined || x === null;
+}
+
+function debugString(val) {
+    // primitive types
+    const type = typeof val;
+    if (type == 'number' || type == 'boolean' || val == null) {
+        return  `${val}`;
+    }
+    if (type == 'string') {
+        return `"${val}"`;
+    }
+    if (type == 'symbol') {
+        const description = val.description;
+        if (description == null) {
+            return 'Symbol';
+        } else {
+            return `Symbol(${description})`;
+        }
+    }
+    if (type == 'function') {
+        const name = val.name;
+        if (typeof name == 'string' && name.length > 0) {
+            return `Function(${name})`;
+        } else {
+            return 'Function';
+        }
+    }
+    // objects
+    if (Array.isArray(val)) {
+        const length = val.length;
+        let debug = '[';
+        if (length > 0) {
+            debug += debugString(val[0]);
+        }
+        for(let i = 1; i < length; i++) {
+            debug += ', ' + debugString(val[i]);
+        }
+        debug += ']';
+        return debug;
+    }
+    // Test for built-in
+    const builtInMatches = /\[object ([^\]]+)\]/.exec(toString.call(val));
+    let className;
+    if (builtInMatches && builtInMatches.length > 1) {
+        className = builtInMatches[1];
+    } else {
+        // Failed to match the standard '[object ClassName]'
+        return toString.call(val);
+    }
+    if (className == 'Object') {
+        // we're a user defined class or Object
+        // JSON.stringify avoids problems with cycles, and is generally much
+        // easier than looping through ownProperties of `val`.
+        try {
+            return 'Object(' + JSON.stringify(val) + ')';
+        } catch (_) {
+            return 'Object';
+        }
+    }
+    // errors
+    if (val instanceof Error) {
+        return `${val.name}: ${val.message}\n${val.stack}`;
+    }
+    // TODO we could test for more things here, like `Set`s and `Map`s.
+    return className;
+}
+
 let WASM_VECTOR_LEN = 0;
 
 const cachedTextEncoder = new TextEncoder();
@@ -84,112 +153,46 @@ function passStringToWasm0(arg, malloc, realloc) {
     return ptr;
 }
 
-function _assertClass(instance, klass) {
-    if (!(instance instanceof klass)) {
-        throw new Error(`expected instance of ${klass.name}`);
+let cachedDataViewMemory0 = null;
+
+function getDataViewMemory0() {
+    if (cachedDataViewMemory0 === null || cachedDataViewMemory0.buffer.detached === true || (cachedDataViewMemory0.buffer.detached === undefined && cachedDataViewMemory0.buffer !== wasm.memory.buffer)) {
+        cachedDataViewMemory0 = new DataView(wasm.memory.buffer);
     }
+    return cachedDataViewMemory0;
+}
+
+function addToExternrefTable0(obj) {
+    const idx = wasm.__externref_table_alloc();
+    wasm.__wbindgen_externrefs.set(idx, obj);
+    return idx;
+}
+
+function handleError(f, args) {
+    try {
+        return f.apply(this, args);
+    } catch (e) {
+        const idx = addToExternrefTable0(e);
+        wasm.__wbindgen_exn_store(idx);
+    }
+}
+
+function getArrayU8FromWasm0(ptr, len) {
+    ptr = ptr >>> 0;
+    return getUint8ArrayMemory0().subarray(ptr / 1, ptr / 1 + len);
 }
 /**
  * @param {string} s
- * @param {StateBuddyTrace} trace
- * @returns {StateBuddyEvalResult}
+ * @param {any} js_trace
+ * @returns {any}
  */
-export function eval_boolean(s, trace) {
+export function eval_boolean(s, js_trace) {
     const ptr0 = passStringToWasm0(s, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
     const len0 = WASM_VECTOR_LEN;
-    _assertClass(trace, StateBuddyTrace);
-    const ret = wasm.eval_boolean(ptr0, len0, trace.__wbg_ptr);
-    return StateBuddyEvalResult.__wrap(ret);
+    const ret = wasm.eval_boolean(ptr0, len0, js_trace);
+    return ret;
 }
 
-const StateBuddyEvalResultFinalization = (typeof FinalizationRegistry === 'undefined')
-    ? { register: () => {}, unregister: () => {} }
-    : new FinalizationRegistry(ptr => wasm.__wbg_statebuddyevalresult_free(ptr >>> 0, 1));
-
-export class StateBuddyEvalResult {
-
-    static __wrap(ptr) {
-        ptr = ptr >>> 0;
-        const obj = Object.create(StateBuddyEvalResult.prototype);
-        obj.__wbg_ptr = ptr;
-        StateBuddyEvalResultFinalization.register(obj, obj.__wbg_ptr, obj);
-        return obj;
-    }
-
-    __destroy_into_raw() {
-        const ptr = this.__wbg_ptr;
-        this.__wbg_ptr = 0;
-        StateBuddyEvalResultFinalization.unregister(this);
-        return ptr;
-    }
-
-    free() {
-        const ptr = this.__destroy_into_raw();
-        wasm.__wbg_statebuddyevalresult_free(ptr, 0);
-    }
-}
-if (Symbol.dispose) StateBuddyEvalResult.prototype[Symbol.dispose] = StateBuddyEvalResult.prototype.free;
-
-const StateBuddyEvalResultEntryFinalization = (typeof FinalizationRegistry === 'undefined')
-    ? { register: () => {}, unregister: () => {} }
-    : new FinalizationRegistry(ptr => wasm.__wbg_statebuddyevalresultentry_free(ptr >>> 0, 1));
-
-export class StateBuddyEvalResultEntry {
-
-    __destroy_into_raw() {
-        const ptr = this.__wbg_ptr;
-        this.__wbg_ptr = 0;
-        StateBuddyEvalResultEntryFinalization.unregister(this);
-        return ptr;
-    }
-
-    free() {
-        const ptr = this.__destroy_into_raw();
-        wasm.__wbg_statebuddyevalresultentry_free(ptr, 0);
-    }
-}
-if (Symbol.dispose) StateBuddyEvalResultEntry.prototype[Symbol.dispose] = StateBuddyEvalResultEntry.prototype.free;
-
-const StateBuddyTraceFinalization = (typeof FinalizationRegistry === 'undefined')
-    ? { register: () => {}, unregister: () => {} }
-    : new FinalizationRegistry(ptr => wasm.__wbg_statebuddytrace_free(ptr >>> 0, 1));
-
-export class StateBuddyTrace {
-
-    __destroy_into_raw() {
-        const ptr = this.__wbg_ptr;
-        this.__wbg_ptr = 0;
-        StateBuddyTraceFinalization.unregister(this);
-        return ptr;
-    }
-
-    free() {
-        const ptr = this.__destroy_into_raw();
-        wasm.__wbg_statebuddytrace_free(ptr, 0);
-    }
-}
-if (Symbol.dispose) StateBuddyTrace.prototype[Symbol.dispose] = StateBuddyTrace.prototype.free;
-
-const StateBuddyTraceEntryFinalization = (typeof FinalizationRegistry === 'undefined')
-    ? { register: () => {}, unregister: () => {} }
-    : new FinalizationRegistry(ptr => wasm.__wbg_statebuddytraceentry_free(ptr >>> 0, 1));
-
-export class StateBuddyTraceEntry {
-
-    __destroy_into_raw() {
-        const ptr = this.__wbg_ptr;
-        this.__wbg_ptr = 0;
-        StateBuddyTraceEntryFinalization.unregister(this);
-        return ptr;
-    }
-
-    free() {
-        const ptr = this.__destroy_into_raw();
-        wasm.__wbg_statebuddytraceentry_free(ptr, 0);
-    }
-}
-if (Symbol.dispose) StateBuddyTraceEntry.prototype[Symbol.dispose] = StateBuddyTraceEntry.prototype.free;
-
 const EXPECTED_RESPONSE_TYPES = new Set(['basic', 'cors', 'default']);
 
 async function __wbg_load(module, imports) {
@@ -228,9 +231,159 @@ async function __wbg_load(module, imports) {
 function __wbg_get_imports() {
     const imports = {};
     imports.wbg = {};
+    imports.wbg.__wbg_Error_e83987f665cf5504 = function(arg0, arg1) {
+        const ret = Error(getStringFromWasm0(arg0, arg1));
+        return ret;
+    };
+    imports.wbg.__wbg___wbindgen_boolean_get_6d5a1ee65bab5f68 = function(arg0) {
+        const v = arg0;
+        const ret = typeof(v) === 'boolean' ? v : undefined;
+        return isLikeNone(ret) ? 0xFFFFFF : ret ? 1 : 0;
+    };
+    imports.wbg.__wbg___wbindgen_debug_string_df47ffb5e35e6763 = function(arg0, arg1) {
+        const ret = debugString(arg1);
+        const ptr1 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        const len1 = WASM_VECTOR_LEN;
+        getDataViewMemory0().setInt32(arg0 + 4 * 1, len1, true);
+        getDataViewMemory0().setInt32(arg0 + 4 * 0, ptr1, true);
+    };
+    imports.wbg.__wbg___wbindgen_in_bb933bd9e1b3bc0f = function(arg0, arg1) {
+        const ret = arg0 in arg1;
+        return ret;
+    };
+    imports.wbg.__wbg___wbindgen_is_function_ee8a6c5833c90377 = function(arg0) {
+        const ret = typeof(arg0) === 'function';
+        return ret;
+    };
+    imports.wbg.__wbg___wbindgen_is_object_c818261d21f283a4 = function(arg0) {
+        const val = arg0;
+        const ret = typeof(val) === 'object' && val !== null;
+        return ret;
+    };
+    imports.wbg.__wbg___wbindgen_is_undefined_2d472862bd29a478 = function(arg0) {
+        const ret = arg0 === undefined;
+        return ret;
+    };
+    imports.wbg.__wbg___wbindgen_jsval_loose_eq_b664b38a2f582147 = function(arg0, arg1) {
+        const ret = arg0 == arg1;
+        return ret;
+    };
+    imports.wbg.__wbg___wbindgen_number_get_a20bf9b85341449d = function(arg0, arg1) {
+        const obj = arg1;
+        const ret = typeof(obj) === 'number' ? obj : undefined;
+        getDataViewMemory0().setFloat64(arg0 + 8 * 1, isLikeNone(ret) ? 0 : ret, true);
+        getDataViewMemory0().setInt32(arg0 + 4 * 0, !isLikeNone(ret), true);
+    };
+    imports.wbg.__wbg___wbindgen_string_get_e4f06c90489ad01b = function(arg0, arg1) {
+        const obj = arg1;
+        const ret = typeof(obj) === 'string' ? obj : undefined;
+        var ptr1 = isLikeNone(ret) ? 0 : passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        var len1 = WASM_VECTOR_LEN;
+        getDataViewMemory0().setInt32(arg0 + 4 * 1, len1, true);
+        getDataViewMemory0().setInt32(arg0 + 4 * 0, ptr1, true);
+    };
     imports.wbg.__wbg___wbindgen_throw_b855445ff6a94295 = function(arg0, arg1) {
         throw new Error(getStringFromWasm0(arg0, arg1));
     };
+    imports.wbg.__wbg_call_e762c39fa8ea36bf = function() { return handleError(function (arg0, arg1) {
+        const ret = arg0.call(arg1);
+        return ret;
+    }, arguments) };
+    imports.wbg.__wbg_done_2042aa2670fb1db1 = function(arg0) {
+        const ret = arg0.done;
+        return ret;
+    };
+    imports.wbg.__wbg_get_7bed016f185add81 = function(arg0, arg1) {
+        const ret = arg0[arg1 >>> 0];
+        return ret;
+    };
+    imports.wbg.__wbg_get_efcb449f58ec27c2 = function() { return handleError(function (arg0, arg1) {
+        const ret = Reflect.get(arg0, arg1);
+        return ret;
+    }, arguments) };
+    imports.wbg.__wbg_get_with_ref_key_1dc361bd10053bfe = function(arg0, arg1) {
+        const ret = arg0[arg1];
+        return ret;
+    };
+    imports.wbg.__wbg_instanceof_ArrayBuffer_70beb1189ca63b38 = function(arg0) {
+        let result;
+        try {
+            result = arg0 instanceof ArrayBuffer;
+        } catch (_) {
+            result = false;
+        }
+        const ret = result;
+        return ret;
+    };
+    imports.wbg.__wbg_instanceof_Uint8Array_20c8e73002f7af98 = function(arg0) {
+        let result;
+        try {
+            result = arg0 instanceof Uint8Array;
+        } catch (_) {
+            result = false;
+        }
+        const ret = result;
+        return ret;
+    };
+    imports.wbg.__wbg_isArray_96e0af9891d0945d = function(arg0) {
+        const ret = Array.isArray(arg0);
+        return ret;
+    };
+    imports.wbg.__wbg_iterator_e5822695327a3c39 = function() {
+        const ret = Symbol.iterator;
+        return ret;
+    };
+    imports.wbg.__wbg_length_69bca3cb64fc8748 = function(arg0) {
+        const ret = arg0.length;
+        return ret;
+    };
+    imports.wbg.__wbg_length_cdd215e10d9dd507 = function(arg0) {
+        const ret = arg0.length;
+        return ret;
+    };
+    imports.wbg.__wbg_new_1acc0b6eea89d040 = function() {
+        const ret = new Object();
+        return ret;
+    };
+    imports.wbg.__wbg_new_5a79be3ab53b8aa5 = function(arg0) {
+        const ret = new Uint8Array(arg0);
+        return ret;
+    };
+    imports.wbg.__wbg_new_e17d9f43105b08be = function() {
+        const ret = new Array();
+        return ret;
+    };
+    imports.wbg.__wbg_next_020810e0ae8ebcb0 = function() { return handleError(function (arg0) {
+        const ret = arg0.next();
+        return ret;
+    }, arguments) };
+    imports.wbg.__wbg_next_2c826fe5dfec6b6a = function(arg0) {
+        const ret = arg0.next;
+        return ret;
+    };
+    imports.wbg.__wbg_prototypesetcall_2a6620b6922694b2 = function(arg0, arg1, arg2) {
+        Uint8Array.prototype.set.call(getArrayU8FromWasm0(arg0, arg1), arg2);
+    };
+    imports.wbg.__wbg_set_3f1d0b984ed272ed = function(arg0, arg1, arg2) {
+        arg0[arg1] = arg2;
+    };
+    imports.wbg.__wbg_set_c213c871859d6500 = function(arg0, arg1, arg2) {
+        arg0[arg1 >>> 0] = arg2;
+    };
+    imports.wbg.__wbg_value_692627309814bb8c = function(arg0) {
+        const ret = arg0.value;
+        return ret;
+    };
+    imports.wbg.__wbindgen_cast_2241b6af4c4b2941 = function(arg0, arg1) {
+        // Cast intrinsic for `Ref(String) -> Externref`.
+        const ret = getStringFromWasm0(arg0, arg1);
+        return ret;
+    };
+    imports.wbg.__wbindgen_cast_d6cd19b81560fd6e = function(arg0) {
+        // Cast intrinsic for `F64 -> Externref`.
+        const ret = arg0;
+        return ret;
+    };
     imports.wbg.__wbindgen_init_externref_table = function() {
         const table = wasm.__wbindgen_externrefs;
         const offset = table.grow(4);
@@ -248,6 +401,7 @@ function __wbg_get_imports() {
 function __wbg_finalize_init(instance, module) {
     wasm = instance.exports;
     __wbg_init.__wbindgen_wasm_module = module;
+    cachedDataViewMemory0 = null;
     cachedUint8ArrayMemory0 = null;
 
 
diff --git a/pkg/argus_wasm_bg.wasm b/pkg/argus_wasm_bg.wasm
index bcc1b44..e705a7e 100644
Binary files a/pkg/argus_wasm_bg.wasm and b/pkg/argus_wasm_bg.wasm differ
diff --git a/pkg/argus_wasm_bg.wasm.d.ts b/pkg/argus_wasm_bg.wasm.d.ts
index 2d93571..ae2987d 100644
--- a/pkg/argus_wasm_bg.wasm.d.ts
+++ b/pkg/argus_wasm_bg.wasm.d.ts
@@ -1,12 +1,10 @@
 /* tslint:disable */
 /* eslint-disable */
 export const memory: WebAssembly.Memory;
-export const __wbg_statebuddytraceentry_free: (a: number, b: number) => void;
-export const __wbg_statebuddytrace_free: (a: number, b: number) => void;
-export const eval_boolean: (a: number, b: number, c: number) => number;
-export const __wbg_statebuddyevalresultentry_free: (a: number, b: number) => void;
-export const __wbg_statebuddyevalresult_free: (a: number, b: number) => void;
-export const __wbindgen_externrefs: WebAssembly.Table;
+export const eval_boolean: (a: number, b: number, c: any) => any;
 export const __wbindgen_malloc: (a: number, b: number) => number;
 export const __wbindgen_realloc: (a: number, b: number, c: number, d: number) => number;
+export const __wbindgen_exn_store: (a: number) => void;
+export const __externref_table_alloc: () => number;
+export const __wbindgen_externrefs: WebAssembly.Table;
 export const __wbindgen_start: () => void;