What is Text Case Conversion?

Different writing contexts require different text cases:

Quick Examples:
Original: "hello world. how are you TODAY?"

UPPER CASE: "HELLO WORLD. HOW ARE YOU TODAY?"
lower case: "hello world. how are you today?"
Title Case: "Hello World. How Are You Today?"
Sentence case: "Hello world. How are you today?"
tOGGLE cASE: "HELLO WORLD. HOW ARE YOU today?"

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