
# sicher 0.1.1
- Adding the `Literal` type check
- Adding the `extend` method to extend a preexisting `list` schema.
- Adding `NonNA()` modifier — rejects any value that contains at least one `NA`.
- Adding `Between(min, max)` — closed-interval numeric range constraint.
- Adding `Matches(pattern)` — PCRE regex-constrained string type.
- Adding `NonEmpty()` modifier — rejects zero-length vectors, lists, and zero-row data frames.

# sicher 0.1.0

-   Initial CRAN submission.
