> 32 bit length incompatibility

[TomNaessens]

I'm working with some large bitsets and I'm experiencing some issues:

ruby 2.7.6p219 (2022-04-12 revision c9c2245c0a) [x86_64-darwin21]

Creating a bitset larger than 2**31 fails:

[1]dev(main)> Bitset.new(2**30); # Is fine
[2]dev(main)> Bitset.new(2**31);
RangeError: integer 2147483648 too big to convert to `int'
from (pry):2:in `initialize'

The cause is probably the NUM2INT used here: https://github.com/ericboesch/bitset/blob/master/ext/bitset/bitset.c#L73

Working around it with the if branch of that method, passing an array gets interesting:

[10]dev(main)> b = Bitset.new([nil] * (2**30)); # Is fine
[13]dev(main)> b.size
=> 1073741824

[14]dev(main)> b = Bitset.new([nil] * (2**31)); # Does not crash!
[16]dev(main)> b.size # The size gets signed though, probaby due to https://github.com/ericboesch/bitset/blob/master/ext/bitset/bitset.c#L80
=> -2147483648

[17]dev(main)> b.set(1); # Indexes get set out of bounds
IndexError: Index out of bounds
from (pry):17:in `set`

[18]dev(main) > b # printing it segfaults

=> [redacted]/1.2.0/lib/bitset.rb:19: [BUG] Segmentation fault at 0xffffffff80081270
ruby 2.7.6p219 (2022-04-12 revision c9c2245c0a) [x86_64-darwin21]

-- Crash Report log information --------------------------------------------
   See Crash Report log file under the one of following:
     * ~/Library/Logs/DiagnosticReports
     * /Library/Logs/DiagnosticReports
   for more details.
Don't forget to include the above Crash Report log file in bug reports.

-- Control frame information -----------------------------------------------
c:0053 p:---- s:0296 e:000295 CFUNC  :to_s
c:0052 p:0019 s:0292 e:000289 METHOD /[redacted]/ruby/2.7.6/lib/ruby/gems/2.7.0/gems/bitset-1.2.0/lib/bitset.rb:19

I guess the NUM2INT and INT2NUM's are the cause here. My CRuby is limited, but switching to NUM2ULL and ULL2NUM or SIZET2NUM and NUM2SIZET (and changing int's to size_t's) could perhaps work?