Version 1.9: "os2" fixes

Hello! Understanding the Odin Programming Language version 1.9 has been released! Get the latest version by simply re-downloading the book.

The changes are as follows:

• Updated usages of core:os in order to match the changes introduced by “os2”. Background: The whole core:os package was replaced during february 2026. After this replacement, some code example changes were needed. A lot of code that used core:os still works, but usages of os.read_entire_file and os.write_entire_file needed some changes.
• External links in the HTML version now open in a new tab.
• Improve the bubble in 10.1.1 about disabling bounds checking.
• Fixed around 30 grammar issues.
• Fixed several minor technical errors.

Enjoy! Thanks for buying my book. /Karl Zylinski