_GUARD</code> value
in janet.h.
</p>
<p>Note that Janet prototypes are not as expressive as metatables in Lua and many other languages.
This is by design, as adding Lua or Python like capabilities would not be technically difficult.
Users should prefer plain data and functions that operate on them rather than mutable objects
with methods. However, some Object Oriented capabilities are useful in Janet for
systems that require extra flexibility.
</p>
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