Obfuscating going wrong - Not same result always

node --version
v10.16.3
"gulp-concat": "~2.3.3",
"gulp-preprocess": "^1.2.0",
"gulp-javascript-obfuscator": "^1.1.2",
The following gulp code is used:

```
var preprocess = require('gulp-preprocess'),
concat = require('gulp-concat'),
javascriptobfuscator = require('gulp-javascript-obfuscator');

gulp.task('app', function() {
return gulp.src('./js/app.js')
.pipe(preprocess({
context: {
HOST: host,
VER: ver
}
}))
.pipe(concat('app.js'))
.pipe(javascriptobfuscator({
reservedStrings:['loadScript','loadCss']
}))
.pipe( gulp.dest('dist/target/js'));
});
```

The following code:
`if(index < scriptFiles.length-1)`

is converted to:
` if (_0x219af0 < _0x441e3a[_0x56ae('0xf')] - 0x1)`

If I step through in Chrome Browser, __0x56ae('0xf')_ is incorrectly equated as '_style_' instead of '_length_'.
If I build it again, it goes fine.
So, it is intermittent. Can somebody point if I am doing anything wrong?

Start with the gulp task shown, especially the ./js/app.js input and generated dist/target/js/app.js, then run the build repeatedly and compare the obfuscated output in Chrome. Done means repeated builds consistently map the length property correctly instead of intermittently producing the style mapping.

Written by the indexing model from the issue text.