From: "nobu (Nobuyoshi Nakada) via ruby-core" Date: 2025-02-03T14:51:11+00:00 Subject: [ruby-core:120871] [Ruby master Misc#21110] Should Marshal.dump always use object links for repeated Float values? Issue #21110 has been updated by nobu (Nobuyoshi Nakada). I agree that `Marshal` should not depend on the details. At least, `Float` should be distinguished only by its value, not its object ID. OTOH, dump of `Float` is often longer: ```ruby Marshal.dump(Math.log(324.0)) #=> "\x04\bf\x165.780743515792329" ``` So it may use with a link just for deduplication, I think. ---------------------------------------- Misc #21110: Should Marshal.dump always use object links for repeated Float values? https://bugs.ruby-lang.org/issues/21110#change-111747 * Author: andrykonchin (Andrew Konchin) * Status: Open ---------------------------------------- I've noticed (during the downstreaming ruby/spec in https://github.com/ruby/ruby/pull/12679) that a repeated Float value may be dumped "directly"/"immediately" without an object link on x86 architecture, and with a link in other cases. It seems it depends on whether Float is `Flonum` or not. amd64: ```ruby Marshal.dump([0.0, 0.0]) # => "\x04\b[\af\x060@\x06", where @\x06 is an object link ``` i686: ```ruby Marshal.dump([0.0, 0.0]) # => "\x04\b[\af\x060f\x060", so f\x060 is dumped twice ``` Both dumps are loaded correctly, so it seems there is no any compatibility issue. Should dumping be consistent and don't depend on architecture? >From https://github.com/ruby/ruby/pull/12679#discussion_r1937116017 -- https://bugs.ruby-lang.org/ ______________________________________________ ruby-core mailing list -- ruby-core@ml.ruby-lang.org To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org ruby-core info -- https://ml.ruby-lang.org/mailman3/lists/ruby-core.ml.ruby-lang.org/