resolve: resolve 1.7.0 fails to find bootstrap's package.json

We’re using bootstrap-loader (pinned at version 2.0.0-beta.22) in our webpack configuration to load bootstrap (pinned at version 4.0.0-alpha.6). bootstrap-loader depends on resolve. We were not pinning resolve’s version. Our build worked with resolve 1.6.0 but fails with 1.7.0 with this curious error message:

ERROR in ./~/bootstrap-loader/lib/bootstrap.loader.js!./~/bootstrap-loader/no-op.js
Module build failed: Error: Cannot find module '/builds/.../node_modules/bootstrap/package.json/package.json'
    at Function.Module._resolveFilename (module.js:325:15)
    at Function.Module._load (module.js:276:25)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at exports.default (/builds/.../node_modules/bootstrap-loader/lib/utils/checkBootstrapVersion.js:8:20)
    at Object.module.exports.pitch (/builds/.../node_modules/bootstrap-loader/lib/bootstrap.loader.js:159:65)
 @ ./~/bootstrap-loader/loader.js 2:17-61
 @ multi ./app/App.jsx bootstrap-loader

Note that it’s looking for node_modules/bootstrap/package.json/package.json instead of node_modules/bootstrap/package.json, which is an existing file.