Json.this - multiple declarations

ref this (
  typeof(null) __param_0
) nothrow @safe;

ref this (
  bool v
) nothrow @safe;

ref this (
  byte v
) nothrow @safe;

ref this (
  ubyte v
) nothrow @safe;

ref this (
  short v
) nothrow @safe;

ref this (
  ushort v
) nothrow @safe;

ref this (
  int v
) nothrow @safe;

ref this (
  uint v
) nothrow @safe;

ref this (
  long v
) nothrow @safe;

ref this (
  std.bigint.BigInt v
) nothrow @trusted;

ref this (
  double v
) nothrow @safe;

ref this (
  string v
) nothrow @trusted;

ref this (
  Json[] v
) nothrow @trusted;

ref this (
  Json[string] v
) nothrow @trusted;

ref this (
  in const(std.json.JSONValue) value
) @safe;