Json.this - multiple declarations

ref this (
  typeof(null) _param_0
) @trusted;

ref this (
  bool v
) @trusted;

ref this (
  byte v
) @safe;

ref this (
  ubyte v
) @safe;

ref this (
  short v
) @safe;

ref this (
  ushort v
) @safe;

ref this (
  int v
) @safe;

ref this (
  uint v
) @safe;

ref this (
  long v
) @trusted;

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

ref this (
  double v
) @trusted;

ref this (
  string v
) @trusted;

ref this (
  Json[] v
) @trusted;

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

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