char_p v returns #t if v is a char and #f otherwise.

is_char v returns true if v is a char and false otherwise.

alphabetic_p v returns #t if v is a char and #f otherwise.

is_alphabetic v returns true if v is a char and false otherwise.

numeric_p v returns #t if v is a number and #f otherwise.

is_numeric v returns true if v is a number and false otherwise.

whitespace_p v returns #t if v is whitespace and #f otherwise.

is_whitespace v returns true if v is whitespace and false otherwise.

upper_case_p v returns #t if v is upper case and #f otherwise.

is_upper_case v returns true if v is upper case and false otherwise.

lower_case_p v returns #t if v is lower case and #f otherwise.

is_lower_case v returns true if v is lower case and false otherwise.

is_both_p v returns #t if v is either lower or upper case and #f otherwise.

is_both v returns true if v is either lower or upper case and false otherwise.

general_category_p v returns #t if v is a general category unicode char and #f otherwise.

is_general_category v returns true if v is a general category unicode char and false otherwise.

from_raw c converts a Guile scheme char c to an OCaml char.

to_raw c converts an OCaml char c to an Guile char.