Attention to detail is critical in software development. Software is described as code, and computers execute the code as it is written, regardless of the intent of the developer.
In the best case, errors are picked up by the developers editor or compiler and can be rapidly fixed. Worst case, errors can lurk for years undetected, causing intermittent small failures, or eventually a critical failure.
When every character matters, it pays to “dot your i’s and cross your t’s”.