The `round` filter - Ruby 2.7 vs 3.1

There's a subtle difference in the round filter's behaviour when using Ruby 3.1, vs Ruby 2.7. Specifically, when the input value is a float (or anything that gets converted to a BigDecimal) and round is given an argument that gets coerced to 0, but is not 0, Ruby 2.7 will output a decimal point with a single zero, whereas Ruby 3.1 will not output a decimal point or trailing zero.

Template

{{ 1.0 | round }}
{{ 1.0 | round: 0 }}
{{ 1.0 | round: "0" }}
{{ 1.0 | round: "abc" }}
{{ 1.0 | round: nosuchthing }}

Output using Ruby 2.7.6

1
1
1.0
1.0
1.0

Output using Ruby 3.1.2

1
1
1
1
1

As far as I can tell, this is due to some fixes in Ruby's BigDecimal library.

The cases with the default argument and an explicit 0 are not affected because of the following line:
https://github.com/Shopify/liquid/blob/698130573651a7a0accc00a953057a9d424836c5/lib/liquid/standardfilters.rb#L772

I'm unsure how significant of a difference this is, but thought it was at least worth mentioning.

Reproduce the listed Liquid template under Ruby 2.7.6 and 3.1.2, then inspect lib/liquid/standardfilters.rb around line 772 and the linked BigDecimal changes. Compare the round filter's behavior for each argument case; the issue does not specify a desired resolution.