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$ perl -E'say sprintf("%.100g", 0.15)'
0.14999999999999999
...

This is perl 5, version 16, subversion 3 (v5.16.3) built for x86_64-li
+nux-thread-multi
(with 40 registered patches, see perl -V for more detail)

$ perl -E'say sprintf("%.100g", 0.15)'
0.1499999999999999944488848768742172978818416595458984375
...

This is perl 5, version 30, subversion 3 (v5.30.3) built for x86_64-li
+nux-thread-multi
(with 96 registered patches, see perl -V for more detail)