Why does the jQuery JSON parser need double escaping for backslashes?

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The first escape escapes it in the Javascript string literal.
The second escape escapes it in the JSON string literal.

The Javascript expression '{"a":"b:\\c"}' evaluates to the string '{"a":"b:\c"}'.
This string contains a single unescaped \, which must be escaped for JSON. In order to get a string containing \\, each \ must be escaped in the Javascript expression, resulting in "\\\\".

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