Issue #17339 has been updated by cryptogopher (crypto gopher). I've sent pull request with solution as specified by author of issue: https://github.com/ruby/bigdecimal/pull/264 ---------------------------------------- Feature #17339: Semantic grouping with BigDecimal#to_s https://bugs.ruby-lang.org/issues/17339#change-103736 * Author: chumaltd (Takahiro Chuma) * Status: Assigned * Priority: Normal * Assignee: mrkn (Kenta Murata) ---------------------------------------- # Abstract Thousands, millions, ... should be expressible with `BigDecimal#to_s`. # Background `BigDecimal('1234567').to_s('3F')` returns "123 456 7.0". # Proposal - Have an option with which `BigDecimal('1234567').to_s('3F')` returns "_1 234 567_.0". - With decimal, `BigDecimal('1234567.8901234').to_s('3F')` should return "1 234 567.890 123 4". - Default behavior should be the above in long term. - And/Or, it would be nice to have a pretty method name. I think #to_s('3F') has universal use cases like money calculation. # Discussion - International System of Units aka SI defines 3-digit-grouping on long numeric sequence. https://www1.bipm.org/jsp/en/ViewCGPMResolution.jsp?CGPM=22&RES=10 - Original discussion in 1948 shows some example of 3-digit-grouping. https://www1.bipm.org/utils/common/pdf/CGPM/CGPM9.pdf#page=117 # Summary We want to have a natural format. -- https://bugs.ruby-lang.org/