[postgis-users] Closed linestring is not closed?

[georgew]

The following linestring which I believed to be closed, and looks closed, in
fact gives me false in reply to st_isclosed(geom).
It's probably something very simple which is eluding me but I am at a loss
why I get this result. I am using postgis 2.0, Win 7 64.
Any suggestions?.
Thank you

select ST_GeomFromEWKT ('SRID=2193;LINESTRING(1581855.1284829
5370000,1581884.80445 5369966.19158,1581887.30288
5369961.19296,1581902.69023 5369908.80888,1581907.78739
5369901.31078,1581945.46961 5369869.11694,1582053.42388
5369814.82165,1582068.01672 5369800.32473,1582058.81757
5369782.83187,1582041.22099 5369762.24115,1582016.32738
5369744.55038,1582008.82968 5369741.95223,1581956.34859
5369744.1582,1581886.27473 5369753.66394,1581876.27826
5369753.56525,1581858.78411 5369750.96838,1581848.78695
5369745.8714,1581826.49107 5369718.28368,1581829.1853
5369683.29527,1581789.4928 5369635.51667,1581784.59315
5369625.42075,1581782.09266 5369615.42448,1581782.19125
5369605.42788,1581762.49236 5369562.74497,1581757.49345
5369557.74732,1581727.60161 5369540.0572,1581717.6048
5369537.45937,1581690.11486 5369539.76211,1581654.93006
5369559.55987,1581644.93496 5369569.45777,1581639.8378
5369576.95587,1581612.24962 5369591.75436,1581597.25527
5369594.15546,1581584.66075 5369601.55455,1581569.56816
5369616.4514,1581567.06973 5369621.45002,1581564.37413
5369646.44183,1581581.67146 5369671.63101,1581614.16168
5369684.32251,1581626.55902 5369696.91662,1581628.95886
5369701.9146,1581628.95989 5369709.41204,1581626.36184
5369716.90982,1581603.67538 5369756.79911,1581598.57889
5369769.19553,1581595.8826 5369789.18905,1581558.00391
5369846.47434,1581532.81696 5369876.36736,1581527.72047
5369888.76378,1581522.42785 5369928.75081,1581494.84072
5369951.1467,1581492.24266 5369958.5445,1581492.04687
5369988.63425,1581488.15835779 5370000,1581855.1284829 5370000)')

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