local npm install: "Error: Unimplemented type: 4" - broken PBF cache

[Piskvor]

Steps to reproduce

• Install mapscii by npm, or by snap (Kubuntu Linux 18.04.2 Bionic Beaver)
• Run mapscii
• Get error

Current behavior

• sudo npm install -g mapscii

  
  npm WARN deprecated coffee-script@1.12.7: CoffeeScript on NPM has moved to "coffeescript" (no hyphen)
  /usr/bin/mapscii -> /usr/lib/node_modules/mapscii/bin/mapscii.sh

• mapscii@0.1.7 added 27 packages from 20 contributors in 1.517s

• mapscii

  
  Error: Unimplemented type: 4
  at Pbf.skip (/usr/lib/node_modules/mapscii/node_modules/pbf/index.js:200:20)
  at Pbf.readFields (/usr/lib/node_modules/mapscii/node_modules/pbf/index.js:41:45)
  at new VectorTile (/usr/lib/node_modules/mapscii/node_modules/@mapbox/vector-tile/lib/vectortile.js:8:23)
  at Tile._loadTile (/usr/lib/node_modules/mapscii/src/Tile.coffee:31:13)
  at /usr/lib/node_modules/mapscii/src/Tile.coffee:26:24
  at tryCatcher (/usr/lib/node_modules/mapscii/node_modules/bluebird/js/release/util.js:16:23)                                                                                             
  at Promise._settlePromiseFromHandler (/usr/lib/node_modules/mapscii/node_modules/bluebird/js/release/promise.js:517:31)
  at Promise._settlePromise (/usr/lib/node_modules/mapscii/node_modules/bluebird/js/release/promise.js:574:18)
  at Promise._settlePromiseCtx (/usr/lib/node_modules/mapscii/node_modules/bluebird/js/release/promise.js:611:10)
  at _drainQueueStep (/usr/lib/node_modules/mapscii/node_modules/bluebird/js/release/async.js:142:12)
  at _drainQueue (/usr/lib/node_modules/mapscii/node_modules/bluebird/js/release/async.js:131:9)
  at Async._drainQueues (/usr/lib/node_modules/mapscii/node_modules/bluebird/js/release/async.js:147:5)
  at Immediate.Async.drainQueues [as _onImmediate] (/usr/lib/node_modules/mapscii/node_modules/bluebird/js/release/async.js:17:14)
  at runCallback (timers.js:705:18)
  at tryOnImmediate (timers.js:676:5)
  at processImmediate (timers.js:658:5)

Welcome to MapSCII! Use your cursors to navigate, a/z to zoom, q to quit.

**Expected behavior**

- map displayed.

**Steps to fix**
- `rm -rf ~/.mapscii/cache`
- app starts normally

[Piskvor]

According to https://wiki.openstreetmap.org/wiki/PBF_Format , Type 4 is optional Info info = 4; // May be omitted in omitmeta - perhaps the downloaded mapfile was corrupt?

Perhaps this could be handled in-app, or at least given a more descriptive error message - meanwhile, the error and fix is discoverable here.