Most fonts are vectors (font scaling is mostly just simple vector math) rather than bitmaps. Additionally, the vector format fonts use internally is highly optimized for usage performance (think about how much text is rendered on a screen at a time or in a document), and to a lesser extent storage size, and not always particularly useful in reverse engineering (reverse designing?) the designer's intent for a given glyph.

Some open source fonts you can see every source control change of SVG documents or similar, which eventually get fed into a font processor for "compilation" into the final font formats.

This is the raw text source used to generate the .otf, .ttf, and .woff2 font files:

https://raw.githubusercontent.com/rsms/inter/master/src/Inte...