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def typecheck(
    func=None,
    *,
    check_return=False,
):
    """
    Perform a runtime type check of the function arguments and (optionally) its
    return type.

    All annotated arguments and keyword arguments will be typechecked. Known

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#ifndef UT_ASSERT_
#define UT_ASSERT_
/** Usage:
 * std >= C++20 (C++23)
 *
 * UT_ASSUME(cond)
 *     Low level primitive. Invokes undefined behaviour if `cond` is false.
 *     Uses [[assume]] if available. Compiler extensions otherwise.
 *
 * ut::unreachable()

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#ifndef UT_TRIM
#define UT_TRIM

/** Usage:
 * std >= C++20
 * Simple string_stream trimming (trims whitespace by default)
 *
 * #include <iostream>
 *
 * int main() {

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# Extract speaker notes (with related headings) from a pandoc markdown document
# Produces valid markdown which can be compiled with pandoc
# Headings are also separated by hrules


# Example usage:
# awk -f get_notes.awk your_source.md | pandoc -f markdown -o your_notes.pdf


## Find the closing div for the notes

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#ifndef UT_PAIR_HPP
#define UT_PAIR_HPP

// A std::pair replacement with no implicit (or any!) constructors.
// All conversions are done through either member functions or static functions
// Also you can use it in a range-based-for loop if the types of `first` and `second` are the same

/**Usage:
 *
 * int main() {

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#ifndef UT_REALLOC_UNIQUE_PTR_HPP
#define UT_REALLOC_UNIQUE_PTR_HPP
#include <memory>
#include <utility>

/**Usage:
 * std >= c++17
 *
 * #include "realloc_unique_ptr.hpp"
 * #include <cstdio>

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#ifndef UT_SV_TO_NUM_HPP
#define UT_SV_TO_NUM_HPP
#include <charconv>
#include <concepts>
#include <optional>
#include <string_view>

/** Usage:
 * int main() {
 *     for (std::string_view sv : {"123", "12.3", "12e3", "abc"}) {

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#ifndef UT_PACK_LOOPS_HPP
#define UT_PACK_LOOPS_HPP

/* Usage:
 * std >= c++17
 *
 * XXX: **DO NOT RETURN FROM UT_PACK_FOR** it uses a lambda so you would only return from that lambda.
 *      If you do want to break the loop, use UT_PACK_BREAK instead of returning.
 *
 * template<std::size_t... sizes>

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# When given a conf file, will look for key "[key]" and print the non-blank,
# lines until the next key or until the end of the file.
#
# All comments are removed as well as leading and trailing spaces
#
# Expects an input variable 'key' (can be passed using `awk -v key="your key here"`)
#
#
# Example:
#

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#ifndef UT_DEFER_HPP
#define UT_DEFER_HPP

/* Usage:
 * std >= c++17
 *
 * Provides the `UT_DEFER` macro, which acts similarly to `defer` in Zig and `scope` in D.
 *
 * If `UT_DEFER_NO_PREFIX` is defined, `defer` can be used instead of `UT_DEFER`.
 *