Warning for Fixnum#size to use RbConfig::SIZEOF['long']
How about add a warning for Fixnum#size ?
% ./ruby -e 'p 0.size' -e:1: warning: Use RbConfig::SIZEOF['long'] instead of Fixnum#size 8
Currently it returns sizeof(long) which is 4 or 8.
However it is implementation detail and
it may difficult to define it in Ruby implementations other than CRuby.
There is a way to obtain sizeof(long): RbConfig::SIZEOF['long']
It works since Ruby 2.1.
% ruby -rrbconfig/sizeof -e "p RbConfig::SIZEOF['long']" 8
So the warning is a migration path to use RbConfig::SIZEOF['long'].
Note that this may affect many code.
So this issue may irritate many people.
fixnum-size-search.txt is a search result in gems.
Updated by cremno (cremno phobia) about 5 years ago
I took a look at
fixnum-size-search.txt and using
RbConfig::SIZEOF['long'] instead usually isn't the correct replacement. In many lines the size of
long in bytes isn't of interest, the min- and maximum value of a fixnum is (see feature request #7517).