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Title: Missing Features
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## Missing Features

The following sections and language features are known to be missing from the
current version of the language specification, but are intended to be added and
implemented. These are not future plans, but rather features that have been
identified as necessary for a complete language specification.

- Complete Type Reference
- The `sqrt` operator
- Constants
- Arrays of structs
- Arrays of non-default types
- Identifiers can be any ascii (or possibly unicode) string without whitespace,
that doesn't start with a digit (`0-9`), `.`, or `:`, and doesn't include `::`
- Integers and floats are allowed to use `_` as deliminator, they are ignored
after lexing, they are just for the programer

### Arrays of non-default types and structs

Array of signed 64-bit integers
```
[1 1 2 3 5 8]
```

Array of signed 16-bit integers
```
[1 1 2 3 5 8 :i16]
```

Array of points
```
(i32 i32 --) { x: y: } ::Point struct

[ {1 0} {2 1} {0 2} {1 2} {2 2} :Point]
```

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