[ruby-core:115736] [Ruby master Bug#20064] Inconsistent behavior between array splat *nil and hash splat **nil

Issue #20064 has been reported by zeke (Zeke Gabrielse). ---------------------------------------- Bug #20064: Inconsistent behavior between array splat *nil and hash splat **nil https://bugs.ruby-lang.org/issues/20064 * Author: zeke (Zeke Gabrielse) * Status: Open * Priority: Normal * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- This has been discussed in #8507 and #9291 but both were closed because they lacked a clear use case. I think the following code should work, showing a clear use case: ```ruby invitation = if params.key?(:inviter_id) { invitation_attributes: params.slice(:inviter_id) } end User.create( email: 'john.doe(a)ruby.example'ple', first_name: 'John', first_name: 'Doe', **invitation, ) ``` Per the previous discussions, this is because `*` uses explicit conversion to array (`to_a`, not `to_ary`), while `**` uses implicit conversion to hash (`to_hash`, not `to_h`). I find it confusing that you can splat nil into an array, but not nil into a hash. It would make sense for `**` to use explicit conversion. -- https://bugs.ruby-lang.org/