LibJS: Convert to_u8() to ThrowCompletionOr

Userland/Libraries/LibJS/Runtime/ArrayBuffer.h

@@ -180,7 +180,7 @@ static ByteBuffer numeric_to_raw_bytes(GlobalObject& global_object, Value value,
             else if constexpr (sizeof(UnderlyingBufferDataType) == 2)
                 int_value = MUST(value.to_u16(global_object));
             else if constexpr (!IsSame<T, ClampedU8>)
-                int_value = value.to_u8(global_object);
+                int_value = MUST(value.to_u8(global_object));
             else
                 int_value = value.to_u8_clamp(global_object);
         }

Userland/Libraries/LibJS/Runtime/Value.cpp

@@ -656,9 +656,9 @@ ThrowCompletionOr<i8> Value::to_i8(GlobalObject& global_object) const
 }
 
 // 7.1.11 ToUint8 ( argument ), https://tc39.es/ecma262/#sec-touint8
-u8 Value::to_u8(GlobalObject& global_object) const
+ThrowCompletionOr<u8> Value::to_u8(GlobalObject& global_object) const
 {
-    double value = TRY_OR_DISCARD(to_number(global_object)).as_double();
+    double value = TRY(to_number(global_object)).as_double();
     if (!isfinite(value) || value == 0)
         return 0;
     auto int_val = floor(fabs(value));

Userland/Libraries/LibJS/Runtime/Value.h

@@ -320,7 +320,7 @@ public:
     ThrowCompletionOr<i16> to_i16(GlobalObject&) const;
     ThrowCompletionOr<u16> to_u16(GlobalObject&) const;
     ThrowCompletionOr<i8> to_i8(GlobalObject&) const;
-    u8 to_u8(GlobalObject&) const;
+    ThrowCompletionOr<u8> to_u8(GlobalObject&) const;
     u8 to_u8_clamp(GlobalObject&) const;
     size_t to_length(GlobalObject&) const;
     size_t to_index(GlobalObject&) const;