| %:% | Type annotation operator |
| %<-% | Type-checked assignment operator |
| Any | Built-in Any Type |
| Bool | Built-in Boolean Type |
| check_type | Type Checking Function |
| create_dataframe_type | Create a Data Frame Type with Column Specification |
| create_list_type | Create a List Type with Specific Structure |
| create_type | Create a Custom Type |
| DataFrame | Built-in DataFrame Type |
| Double | Built-in Double Type |
| Enum | Enum Type Factory |
| Function | Built-in Function Type |
| infer_type | Infer a Type from an R Object |
| Integer | Built-in Integer Type |
| List | Built-in List Type |
| ListOf | Create a homogeneous list type |
| Null | Built-in Null Type |
| Numeric | Built-in Numeric Type |
| Optional | Create an optional (nullable) type variant |
| print.sicher_type | Print method for sicher_type |
| print.sicher_typed_annotation | Print method for sicher_typed_annotation |
| print.sicher_typed_function | Print method for sicher_typed_function |
| print.sicher_union | Print method for sicher_union |
| Readonly | Create a readonly type variant |
| Scalar | Create a scalar (length-1) type variant |
| String | Built-in String Type |
| typed_function | Create a type-checked function |
| union-operator | Union Type Operator |
| [.sicher_type | Vector Size Operator for sicher_type |
| |.sicher_type | Union Type Operator |
| |.sicher_union | Union Type Operator |