array?, object?, boolean?, number?, string?, null?, list?, dict?, hash?, nil?, false?, true?, pair?, float?
Returns true if the argument or the incoming ret matches in type.
array? [] # => true,
[]; array? _ # => true,
array? false # => false,
false; array? _ # => false,
object? {} # => true,
object? false # => false,
number? 0 # => true,
number? 0.1 # => true,
number? "dang" # => false,
number? [] # => false,
string? "hello" # => true,
string? [] # => false,
true? true # => true,
true? false # => false,
true? 0 # => false,
boolean? true # => true,
boolean? false # => true,
boolean? [] # => false,
null? null # => true,
null? 0 # => false,
false? false # => true,
false? true # => false,
false? "false" # => false,
nil? null # => true,
nil? 0 # => false,
pair? [ 0 1 ] # => true,
pair? [] # => false,
pair? 0 # => false,
float? 1.0 # => true,
float? 1 # => false,
float? {} # => false,
boolean? true tag: "xxx" # => true,
true; boolean? tag: "xxx" # => true,
string? {} tag: "xxx" # => false,
{}; string? tag: "xxx" # => false,