Animations are in most cases represented as simple curves (and sometimes are as references to other objects, think of sprite switching animations). Animations that are authored properly usually take very limited amount of space as they are represented as curves with a bunch of control points.
Some animations, however, are quite sizeable: most notably, fine humanoid animations featuring hundreds and thousands of keyframes to represent fine movements of individual limbs. Similar to meshes, there is a precision reduction option for optimising animations in such instances without requiring the artists to re-author them.
Let's start by navigating to the Assets section and the Animations tab in Luna UI:
The highlighted part of the screenshot above is the section that describes parameters applied to exported sounds by default.
This will instruct Luna to use half-precision
floats for storing animation data, reducing the size taken by 50%. It is almost impossible to predict whether it is going to be noticeable in the final product, but in many cases the difference will be negligable. These
floats still have 3 precision digits, which is enough for many cases.
All of the above settings are also available on a per-folder and per-animation level. Developers can choose a folder of a file by ticking a checkbox in "Per-animation settings" section of the window and use the same fields to tweak parameters of a specific animation(s):