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Fails when adding items with long arrays in filter fields

See original GitHub issue

/Users/eklem/git_modules/search-index-indexer/node_modules/search-index/node_modules/levelup/node_modules/level-codec/index.js:34
  return this._valueEncoding(opts, batchOpts).encode(value);
                                              ^

RangeError: Invalid string length
    at Object.stringify [as encode] (native)
    at Codec.encodeValue (/Users/eklem/git_modules/search-index-indexer/node_modules/search-index/node_modules/levelup/node_modules/level-codec/index.js:34:47)
    at /Users/eklem/git_modules/search-index-indexer/node_modules/search-index/node_modules/levelup/node_modules/level-codec/index.js:56:23
    at Array.map (native)
    at Codec.encodeBatch (/Users/eklem/git_modules/search-index-indexer/node_modules/search-index/node_modules/levelup/node_modules/level-codec/index.js:48:14)
    at LevelUP.batch (/Users/eklem/git_modules/search-index-indexer/node_modules/search-index/node_modules/levelup/lib/levelup.js:307:26)
    at /Users/eklem/git_modules/search-index-indexer/node_modules/search-index/node_modules/search-index-adder/index.js:228:30
    at /Users/eklem/git_modules/search-index-indexer/node_modules/search-index/node_modules/async/lib/async.js:52:16
    at /Users/eklem/git_modules/search-index-indexer/node_modules/search-index/node_modules/async/lib/async.js:269:32
    at /Users/eklem/git_modules/search-index-indexer/node_modules/search-index/node_modules/async/lib/async.js:44:16

To reproduce:

$ npm install search-index-searcher

and then:

$ node --max-old-space-size=12288 index.js -c https://raw.githubusercontent.com/eklem/recipes-klikk-dataset/master/config.json -d https://raw.githubusercontent.com/eklem/recipes-klikk-dataset/master/klikk-recipes.json -s 5054 -e 5054

Should maybe cut off too long arrays. That would be the best I think. Second best would be to fail gracefully and give a meaningful error message.