| arg_between | Check Values in Range |
| arg_character | Check Character Argument |
| arg_data | Check Common Argument Types |
| arg_dots_supplied | Check Supplied Dots Argument |
| arg_element | Check Element |
| arg_equal | Check Equal Arguments |
| arg_formula | Check Formula Argument |
| arg_function | Check Function Argument |
| arg_index | Check Index Argument |
| arg_is | Check Argument Class |
| arg_length | Check Argument Length |
| arg_logical | Check Logical Argument |
| arg_named | Check Named Argument |
| arg_no_NA | Check NA in Argument |
| arg_non_null | Check NULL Argument |
| arg_numeric | Check Numeric Argument |
| arg_or | Check That Arguments Meet Some or All Criteria |
| arg-package | arg: Clean and Simple Argument Checking |
| arg_supplied | Check Supplied Argument |
| arg_symmetric | Check Symmetric Matrix Argument |
| arg_unique | Check Unique Argument |
| err | Throw an Error, Warning, or Message |
| match_arg | Argument Verification |
| when_supplied | Check Arguments When Supplied |
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