Round transfer-function terms, if only for printing

When I enter some parameter values into a complicated expression (with multiple fractions, often nested and multiplied with each other), the resulting transfer function will often have coefficients like 4.99999999999999 with something like 12 digits. This makes visual inspection and comparisons of the resulting transfer function very annoying to deal with, and it seems like no benefit is to be gained - in most cases, if one works through it symbolically, the rounded value the actual value. I would like to suggest that each term in transfer functions is rounded off after something like the 10th decimal. I believe that this would fix the problem as described in many cases, without rounding being aggressive enough it causes problems.

I don't think I have the know-how to make a good implementation of this, and I want to check if others agree before I make an attempt at some implementation, so I am only inviting discussion here for now.

The issue names no files, tests, or entry points, and proposes discussion rather than a defined implementation. First locate where transfer-function terms are constructed or printed, then clarify the rounding policy and add focused coverage showing that displayed coefficients are rounded without changing underlying values.