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Feature #15151

Updated by chopraanmol1 (Anmol Chopra) almost 2 years ago

String#slice! when used at beginning of string (e.g. slice!(0,10)) slice!(0,10) calls rb_str_drop_bytes which creates shared string for non embed string. str_modify_keep_cr clears the flag of shared string which is called before rb_str_drop_bytes. Due to which while calling slice! multiple time on same string creates multiple duplicate string. 

 Patch: 

 https://github.com/ruby/ruby/pull/1961 

 Comparison: 
 trunk: 
 ~~~ 
 Total allocated: 141116188 bytes (11250 objects) 

   0.048000     0.000000     0.048000 (    0.045974) 
 ~~~ 

 patch: 
 ~~~ 
 Total allocated: 300080 bytes (7502 objects) 

   0.016000     0.004000     0.020000 (    0.017376) 
 ~~~

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