> For the complete documentation index, see [llms.txt](https://docs.internetobject.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.internetobject.org/structure-and-syntax/case-sensitivity.md).

# Case Sensitivity Rules

Internet Object is **case-sensitive** throughout. Keys, keywords, and type names must be written with exact casing.

## Keys

Member keys are distinct by case — `Name` and `name` are two different fields:

```ruby
Name: string, name: string
---
{ Name: Alice, name: alice }
```

## Keywords

The literal keywords must be written exactly as defined. Their accepted forms are:

| Meaning      | Accepted      | Not accepted        |
| ------------ | ------------- | ------------------- |
| true         | `T`, `true`   | `t`, `True`, `TRUE` |
| false        | `F`, `false`  | `f`, `False`        |
| null         | `N`, `null`   | `n`, `Null`         |
| not-a-number | `NaN`         | `nan`, `NAN`        |
| infinity     | `Inf`, `-Inf` | `inf`, `Infinity`   |

```ruby
active: bool
---
~ T        # ✓
~ true     # ✓
~ t        # ✗ not-a-bool
```

## Type names

Built-in type names are lowercase: `string`, `int`, `uint8`, `bool`, `datetime`, `decimal`, and so on. `String` or `INT` are not recognized types.

## See Also

* [Booleans](/structure-and-syntax/values/booleans.md) · [Nulls](/structure-and-syntax/values/null.md)
* [Structural Characters & Separators](/structure-and-syntax/structural-elements/structural-characters-n-keywords.md)


---

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