LibJS: Convert to_i8() to ThrowCompletionOr

Userland/Libraries/LibJS/Runtime/ArrayBuffer.h

@@ -173,7 +173,7 @@ static ByteBuffer numeric_to_raw_bytes(GlobalObject& global_object, Value value,
             else if constexpr (sizeof(UnderlyingBufferDataType) == 2)
                 int_value = MUST(value.to_i16(global_object));
             else
-                int_value = value.to_i8(global_object);
+                int_value = MUST(value.to_i8(global_object));
         } else {
             if constexpr (sizeof(UnderlyingBufferDataType) == 4)
                 int_value = MUST(value.to_u32(global_object));

Userland/Libraries/LibJS/Runtime/Value.cpp

@@ -639,9 +639,9 @@ ThrowCompletionOr<u16> Value::to_u16(GlobalObject& global_object) const
 }
 
 // 7.1.10 ToInt8 ( argument ), https://tc39.es/ecma262/#sec-toint8
-i8 Value::to_i8(GlobalObject& global_object) const
+ThrowCompletionOr<i8> Value::to_i8(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 abs = fabs(value);

Userland/Libraries/LibJS/Runtime/Value.h

@@ -319,7 +319,7 @@ public:
     ThrowCompletionOr<u32> to_u32(GlobalObject&) const;
     ThrowCompletionOr<i16> to_i16(GlobalObject&) const;
     ThrowCompletionOr<u16> to_u16(GlobalObject&) const;
-    i8 to_i8(GlobalObject&) const;
+    ThrowCompletionOr<i8> to_i8(GlobalObject&) const;
     u8 to_u8(GlobalObject&) const;
     u8 to_u8_clamp(GlobalObject&) const;
     size_t to_length(GlobalObject&) const;