Misc #19971
Updated by andrykonchin (Andrew Konchin) 12 months ago
I've noticed that such proc `proc { |a,| }` has arity `1`:
```ruby
proc { |a,| }.arity # => 1
```
`1` that means only one 1 required parameter, but the proc behaves similar to like there is a proc with explicit rest parameter (`proc { |a, *| }`) that has arity `-2`:
```ruby
proc { |a, *| }.arity # => -2
```
that `-2` (that means one 1 required parameter and + rest parameter. parameter).
So I am wondering whether it's intentional behaviour and what the rational is behind it.