in sub-replace-expression('\=')

Hi all;

Could anyone tell me why <NL>(0x0a) should be replaced by <CR>(0x0d)
in sub-replace-expression('\=')?

See the following code snippet;

function! s:nl()
return "\n"
endfunction
echomsg substitute('a', '.', "\n", "") "(1)
echomsg substitute('a', '.', '\=s:nl()', "") "(2)

(1) returns <NL>(0x0a), (2) returns <CR>(0x0d).

Why such design choice was done?

Thank you in advance.

Motoya Kurotsu

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