Standards followed in this framework

Use four spaces for indentation. No tabs.
Shell/local variables and function names follow "snake_case" - only lowercase letters, underscores, and digits.
Environment variables use all uppercase names. For example, BASE_HOME, BASE_HOST, BASE_OS, BASE_SOURCES. See: https://stackoverflow.com/a/42290320/6862601
In rare cases of global variables being shared between library functions and their callers, use all uppercase names. For example: OUTPUT and OUTPUT_ARRAY
Place most code inside functions and invoke the main function at the bottom of the script.
In libraries, have top level code that prevents the file from being sourced more than once. For example:
```
[[ $__stdlib_sourced__ ]] && return
__stdlib_sourced__=1
```
Make sure all local variables inside functions are declared local.
Use func naming convention for special purpose variables and functions. Use a leading underscore for "private" variables and functions.
Double quote all variable expansions, except:
- inside [[ ]] or (( ))
- places where we need word splitting to take place
Use [[ $var ]] to check if var has non-zero length, instead of [[ -n $var ]]. See: https://stackoverflow.com/a/49825114/6862601

Use "compact" style for if statements and loops:

if condition; then
    ...
fi

while condition; do
...
done

for ((i=0; i < limit; i++)); do
...
done

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