:sig
String ascii_safe_name(String raw)

:params
raw : input string to normalize
return value : ASCII-safe identifier made from letters, digits, and underscores

:desc
Builds a conservative identifier by keeping ASCII letters, digits, and underscores and dropping other characters.

This is useful when turning user- or config-provided names into handler suffixes, DOM-safe variable stems, or CSS/JS hook names.

:see
>string