lower integer bound not supported

According to documentation (from 9.1 to 9.5) the supported
integer ranges are these ones:

smallint 2 bytes -32768 to +32767
integer 4 bytes -2147483648 to +2147483647
bigint 8 bytes -9223372036854775808 to +9223372036854775807

But the lowest bound is not really supported:

# select -32768::int2;
ERROR: smallint out of range
# select -2147483648::int4;
ERROR: integer out of range
# select -9223372036854775808::int8;
ERROR: bigint out of range

This happens with server versions 9.1.22, 9.3.6 and 9.5(unspecified).

Is it the code or the documentation being broken ?
To me, the documentation makes the most sense, and the code is broken.

--strk;

() Free GIS & Flash consultant/developer
/\ https://strk.kbt.io/services.html