Deleting specific keys from ordered table leaves it in invalid state.

[yglukhov]

import tables

# The bug is reproducible only with exact keys
const key1 = "boy_jackpot.inGamma"
const key2 = "boy_jackpot.outBlack"

var t = {
    key1: 0,
    key2: 0
}.toOrderedTable()

assert(key2 in t) # Passes
t.del(key1)
echo t # Prints {boy_jackpot.outBlack: 0}
assert(key2 in t) # Fails

Arch: amd64. This is not a recent regression. More likely the bug existed since i've first introduced del for OrderedTable.

[yglukhov]

Looks like del impl for OrderedTable is flawed because it doesn't account for collision clusters.