The unibyte and multibyte text representations use different character
codes. The valid character codes for unibyte representation range from
0 to 255--the values that can fit in one byte. The valid character
codes for multibyte representation range from 0 to 524287, but not all
values in that range are valid. The values 128 through 255 are not
entirely proper in multibyte text, but they can occur if you do explicit
encoding and decoding (see section 33.10.7 Explicit Encoding and Decoding). Some other character
codes cannot occur at all in multibyte text. Only the ASCII codes
0 through 127 are completely legitimate in both representations.
Function:char-valid-pcharcode &optional genericp
This returns t if charcode is valid for either one of the two
text representations.
(char-valid-p 65)
=> t
(char-valid-p 256)
=> nil
(char-valid-p 2248)
=> t
If the optional argument genericp is non-nil, this function
returns t if charcode is a generic character
(see section 33.7 Splitting Characters).
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