String(double, decimals) / dtostrf - decimal part looses leading zeros

[AdiGitalEU]

Any leading zeros in decimal part of a float/double are removed after the conversion.

Example for f = 2.005

Serial.print( f, 4 ) => 2.0050
Serial.print( f ) = 2.01
Serial.print( String( f, 4 ) => 2.50
dtostrf( f, ..., 4, ... ) => 2.50

• OS: Windows

• Arduino IDE version: 1.8.8

• STM32 core version: 1.4.0

• Tools menu settings if not the default: default

• Upload method: STLink

• Name: STM32F1C8T6 BluePill clone

[fpistm]

Thanks @AdiGitalEU for report.
This is now fix in #435