@igorpeshansky I have tested the patch and wanted to bring to your attention a potential compatibility concern with Ruby versions lower than 2.7.0, despite the gemspec specifying a requirement of ">= 2.2". The error encountered during compilation in Ruby version 2.3.1 is as follows:

[ABHIJITH-EA]

          @igorpeshansky I have tested the patch and wanted to bring to your attention a potential compatibility concern with Ruby versions lower than 2.7.0, despite the gemspec specifying a requirement of ">= 2.2". The error encountered during compilation in Ruby version 2.3.1 is as follows:

compiling unf.cc
cc1plus: warning: command line option ‘-Wdeclaration-after-statement’ is valid for C/ObjC but not for C++ [enabled by default]
cc1plus: warning: command line option ‘-Wimplicit-function-declaration’ is valid for C/ObjC but not for C++ [enabled by default]
unf.cc:45:3: error: ‘rb_data_type_struct::<anonymous struct>’ has no non-static data member named ‘dcompact’
   };
   ^
make: *** [unf.o] Error 1

The "dcompact" member, which I believe was introduced in Ruby version 2.7.0, is the source of this issue. This patch appears to not fully resolve the issue introduced by #72

Originally posted by @ABHIJITH-EA in #75 (comment)