Types

MistQL has 8 core datatypes, many of which correspond to their JSON counterparts.

External types are types that can be either provided or returned by a MistQL query. All other types are considered internal and cannot be provided to or returned from MistQL.

Type	Primitive	External	Comment
string	✔	✔
number	✔	✔	Doubles, without NaN or infinity
boolean	✔	✔
null	✔	✔
object		✔	Stringly typed keys
array		✔	Can be nonhomogenous
function			Arity not part of type system
regex

Type Equality

Equality in MistQL is strict, meaning that if two variables have different data types, they are considered unequal.

Type	Equality	Truthiness
string	exact	false if empty, true otherwise
number	IEEE 754 compliant	IEEE 754 compliant
boolean	exact	Standard
null	true	false
object	Deep equality	false if empty, true otherwise
array	Deep equality	false if empty, true otherwise
function	Referential	true
regex	On source and flag	true

Casting Tables

MistQL defines casting from some types to other types

Type	Cast to Float	Cast To String
string	Parsed as float, as per JSON standard.	noop
number	noop	As base 10 float. If number is an integer, no trailing digits or decimal. Exponential notation when not within non-inclusive range 1e-7 to 1e21
boolean	1 for true, 0 for false	"true" for true, "false" for false
null	0	"null"
object	Throws error	Concise JSON, recursively converting items
array	Throws error	Concise JSON, recursively converting items
function	Throws error	Throws error
regex	Throws error	Throws error