Function validate

example/cacheHierarchy/fkYAML/node.hpp:1867–1870

@brief Checks if `byte` is a valid 1-byte UTF-8 character. @param[in] byte The byte value. @return true if `byte` is a valid 1-byte UTF-8 character, false otherwise.

/// @param[in] byte The byte value.
/// @return true if `byte` is a valid 1-byte UTF-8 character, false otherwise.
inline bool validate(uint8_t byte) noexcept {
    // U+0000..U+007F
    return byte <= 0x7Fu;
}

/// @brief Checks if the given bytes are a valid 2-byte UTF-8 character.
/// @param[in] byte0 The first byte value.