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The documentation says, "the q option formats a string between double quotes, using escape sequences when necessary to ensure that it can safely be read back by the Lua interpreter". However, this is not true if the string contains certain escape sequences, such as \027 or \013:

    t1=string.format("%q", t)	--> "\27[1maha\27[m"

On an xterm in Linux print(t) prints a nice bold aha, while print(t1)
prints "\27[1maha\27[m". Is that a bug or am I missing something?