JSON
  object    {"foo": "bar"}
  array     ["foo", "bar", 3.14]
  string    "hello \u0057orld"      → Unicode strings
  number    3.14                    → unlimited, but IEEE double precision in practice
  bool      true
  null      null

TOML  https://quickref.me/toml
  Array                [1, 2, []]
  Table/inline table   [my-table]
                       key = "value"
                       inline = { key = "value" }
  string               "foobar"                      → Unicode string
  integer              3_14                          → 64-bit signed int
  float                3.14                          → IEEE 754 double precision, incl. {NaN, +inf, -inf}
  boolean              false
  offset date-time     1970-05-27T07:32:00Z          RFC 3339
  local date-time      1970-05-27T07:32:00           RFC 3339
  local date           1970-05-27                    RFC 3339
  local time           07:32:00                      RFC 3339

YAML  https://quickref.me/yaml
  tag:yaml.org,2002:null       null
  tag:yaml.org,2002:bool       true
  tag:yaml.org,2002:int        34              signed 32-bit integers or more
  tag:yaml.org,2002:float      12e03           IEEE 754 single precision, incl. {.inf, -.Inf, .NAN}
  tag:yaml.org,2002:seq        [name, hr, avg]
  tag:yaml.org,2002:str
  tag:yaml.org,2002:map        hr:65
  directive                    %TAG !yaml! tag:yaml.org,2002
  anchor property              &a1
  alias node                   *a1