If the strict parsing bit is enabled:

- JsonScanner will reject comments
- JsonParser will reject multiple object and array definitions as top
  level elements
- JsonParser will reject leading space and empty JSON data

Conformance tests:

- n_object_trailing_comment.json
- n_object_trailing_comment_slash_open.json
- n_single_space.json
- n_structure_double_array.json
- n_structure_no_data.json
- n_structure_object_with_comment.json
- n_structure_UTF8_BOM_no_data.json