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libc/inet/ether_addr.c: optimize tolower, we ever use it on 0-9a-f
libc/inet/ntop.c: optimize tolower, we ever use it on 0-9a-f
with locale support on, code size change is:
text data bss dec hex filename
- 396 0 24 420 1a4 libc/inet/ether_addr.os
+ 306 0 24 330 14a libc/inet/ether_addr.os
- 1453 0 0 1453 5ad libc/inet/ntop.os
+ 1430 0 0 1430 596 libc/inet/ntop.os
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