Feature Request: Change Precision Parameter to Rounding Parameter

[9-FS]

Currently, precision is enforced by optionally truncating to a fixed number of digits behind the comma .# or to a significant amount of digits ~#. Usually, this is undesired for displaying numbers and rounding is preferred.

Examples of desired behaviour

static rounding

• [.3] 42069.69 => "42069.690"; trailing "0" gets added
• [.2] 42069.69 => "42069.69"; nothing happens
• [.1] 42069.69 => "42069.7"; rounded to 0.1s
• [.0] 42069.69 => "42070"; rounded to whole numbers
• [.-1] 42069.69 => "42100"; rounded to 10s
• ...
• [.-5] 42069.69 => "0"; rounded to 100000s, rounds number away completely

dynamic rounding

• [~5] 69.69 => "69.690"; trailing "0" gets added
• [~4] 69.69 => "69.69"; nothing happens
• [~3] 69.69 => "69.7"
• [~2] 69.69 => "70"
• [~1] 69.69 => "70"
• [~0] 69.69 => "0"; always returns "0"
• [~-1] invalid option

[9-FS]

For everyone in the future coming here looking for that feature: Since this project seems abandoned, I wrote my own crate implementing the desired features called scaler.

[seijikun]

This issue was not actually completed. The current implementation is still just cutting off after n decimals, instead of rounding.
Could this please be revisited, @kurtlawrence ?

[kurtlawrence]

Hi @seijikun. The issue should not have been closed prematurely. I can take a look at implementing rounding, I need to find some time to have a think about implementation first.