https://issues.dlang.org/show_bug.cgi?id=17555

          Issue ID: 17555
           Summary: [REG2.070.0] Control characters in JSON data are
                    invalid and should cause an exception
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: dlang-bugzilla@thecybershadow.net

As per the JSON spec, raw control characters are not allowed in Unicode data. D correctly threw upon encountering them before 2.070.0.

Test case:

//////////////// test.d ////////////////
import std.exception;
import std.json;

void main()
{
    assertThrown(parseJSON("\"a\nb\""));
}
////////////////////////////////////////

After 2.070, parseJSON returns nonsense data:

writeln(parseJSON("\"a\nb\"").str)

produces:

a\u000Ab

(i.e. the characters are "escaped" despite being decoded, not encoded).

Introduced in https://github.com/dlang/phobos/pull/3872

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