t/misc.t fails with -Duselongdouble

[eserte]

If perl is compiled with increased floating point accuracy (i.e. with the configuration option -Duselongdouble) then the test suite fails:

#   Failed test 'v array'
#   at t/misc.t line 31.
#     Structures begin differing at:
#          $got->[0] = '12.3000000000000007'
#     $expected->[0] = '12.3'

    #   Failed test 'x'
    #   at t/misc.t line 37.
    #          got: '12.3000000000000007'
    #     expected: '12.3'

    #   Failed test 'z'
    #   at t/misc.t line 39.
    #          got: '56.7000000000000028'
    #     expected: '56.7'

    #   Failed test 't'
    #   at t/misc.t line 40.
    #          got: '-78.9000000000000057'
    #     expected: '-78.9'
    # Looks like you failed 3 tests of 4.
... etc ...
#   Failed test 'PJ_UV'
#   at t/misc.t line 121.

    #   Failed test 'lam'
    #   at t/misc.t line 126.
    #          got: '12.3000000000000007'
    #     expected: '12.3'
    # Looks like you failed 1 test of 2.

#   Failed test 'PJ_LP'
#   at t/misc.t line 128.
# Looks like you failed 13 tests of 28.
t/misc.t ........ 
Dubious, test returned 13 (wstat 3328, 0xd00)
Failed 13/28 subtests