If you give 80,001 characters to a Text Area you get a message and the record is not saved.

a) If you set a "Maximum number of text characters in input" the maximum value you can type is 9999, strangely not 80,000.

b) If in this instance you give 80,001 characters the record is saved, the Text Area value being silently truncated to 9999 characters.

These seem a little inconsistent.