`clupoints_n_1` tests fail in very specific case in `full` mode

[nunofachada]

Failures as follows:

✖ | 3     9618045 | clupoints_n_1 [22983.5s]
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Failure (test_clupoints_n_1.R:58): clupoints_n_1: nd=2, len=0, tpts=2000, lat_std=500, direc=[0.518515454834999, 0.855068256396677], ctr=[0.62911404389888, 0.687022846657783]
(direc %*% u)[1] (`actual`) not equal to 0 (`expected`).

  `actual`: -0.00000006
`expected`:  0.00000000

Failure (test_clupoints_n_1.R:58): clupoints_n_1: nd=2, len=0, tpts=10000, lat_std=500, direc=[0.612286506668911, 0.790635967908861], ctr=[0.551435014465824, 0.677570635452867]
(direc %*% u)[1] (`actual`) not equal to 0 (`expected`).

  `actual`: -0.00000003
`expected`:  0.00000000

Failure (test_clupoints_n_1.R:58): clupoints_n_1: nd=2, len=0, tpts=10000, lat_std=500, direc=[0.703352508874921, 0.710841225773628], ctr=[0.453334156190977, 0.899824970401824]
(direc %*% u)[1] (`actual`) not equal to 0 (`expected`).

  `actual`: 0.00000005
`expected`: 0.00000000