Provides helper functions for developing modules.

• add-zsh-trap adds a function name to a list to be called when a trap is triggered.
• is-autoloadable checks if a file can be autoloaded by trying to load it in a subshell.
• is-callable checks if a name is a command, function, or alias.
• is-true checks a boolean variable for "true".
• coalesce prints the first non-empty string in the arguments array.

The authors of this module should be contacted via the issue tracker.

• Sorin Ionescu