Data type reference

Table 1. Underlying types for core expression types:
Type	Golang type	Notes
`Vars`	`map[string]TypedValue{}`	For complex key-value structures.
`Any`	`interface{}`
`Integer`	`int64`	64-bit integer; range `-9223372036854775808` through `9223372036854775807`.
`UnsignedInteger`	`uint64`	64-bit unsigned integer; range `0` through `18446744073709551615`.
`ID`	`uint64`	64-bit unsigned integer; range `0` through `18446744073709551615`.
`Float`	`float64`	IEEE-754 64-bit floating-point numbers.
`Array`	`[]TypedValue`	Can hold zero or more typed values.
`Boolean`	`bool`	`true` or `false`.
`DateTime`	`*time.Time`	Date time type.
`Duration`	`time.Duration`	Duration type.
`Handle`	`string`	Expects valid handle; empty string or match for `/^[A-Za-z][0-9A-Za-z_\-.]*[A-Za-z0-9]$/`.
`KV`	`map[string]string`	Simple key-value structure.
`KVV`	`map[string][]string`	Simple key-values structure, used for url query params, headers.
`Reader`	`io.Reader`	When dealing with files or streams of data.
`String`	`string`