Uppercase and Lowercase (MIT/GNU Scheme 12.0.90)

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#### 1.3.4 Uppercase and Lowercase

Scheme doesn’t distinguish uppercase and lowercase forms of a letter except within character and string constants; in other words, Scheme is case-insensitive. For example, ‘`Foo`’ is the same identifier as ‘`FOO`’, and ‘`#x1AB`’ is the same number as ‘`#X1ab`’. But ‘`#\a`’ and ‘`#\A`’ are different characters.