Some things the author could have included: - const is not the same as immutability, you could have a const variable pointing to a non-const data structure. -

Some things the author could have included: - const is not the same as immutability, you could have a const variable pointing to a non-const data structure. - Type-stability can be checked using the '@code_warntype' macro. - While Julia's built-in arrays are columnar, user defined array types (for which there are dozens in the wild) can be formatted in any way.