When capacity of padded_string_view is given a size smaller than length, padding() is wrapping.
Therefore, parser::iterate_raw does not return INSUFFICIENT_PADDING error.

simdjson::ondemand::parser parser;
size_t bad_capacity = 0;
auto doc = parser.iterate("{\"a\": 0 }", bad_capacity);
auto error = doc.error(); // SUCCESS

It seems addition is better.

  if (json.capacity() < json.length() + SIMDJSON_PADDING) { return INSUFFICIENT_PADDING; }

Configuration

• OS: Windows 10 64-bit
• Compiler: MSVC 17.8.6
• Version: 3.6.4
• Optimization setting: /Od