Turns out some of the internal tests don't like the use of NumberStyles.Float, but they are fine with NumberStyles.Any. NumberStyles.Any includes the exponential style, so we're good.

EricWilson-BluePrism · EricWilson-BluePrism · commit 59e0b72ebfea · 2021-04-16T16:07:55.000-05:00
diff --git a/src/Microsoft.OpenApi.Readers/V2/OpenApiSchemaDeserializer.cs b/src/Microsoft.OpenApi.Readers/V2/OpenApiSchemaDeserializer.cs
@@ -26,13 +26,13 @@ internal static partial class OpenApiV2Deserializer
             {
                 "multipleOf", (o, n) =>
                 {
-                    o.MultipleOf = decimal.Parse(n.GetScalarValue(), NumberStyles.Float, CultureInfo.InvariantCulture);
+                    o.MultipleOf = decimal.Parse(n.GetScalarValue(), NumberStyles.Any, CultureInfo.InvariantCulture);
                 }
             },
             {
                 "maximum", (o, n) =>
                 {
-                    o.Maximum = decimal.Parse(n.GetScalarValue(), NumberStyles.Float, CultureInfo.InvariantCulture);
+                    o.Maximum = decimal.Parse(n.GetScalarValue(), NumberStyles.Any, CultureInfo.InvariantCulture);
                 }
             },
             {
@@ -44,7 +44,7 @@ internal static partial class OpenApiV2Deserializer
             {
                 "minimum", (o, n) =>
                 {
-                    o.Minimum = decimal.Parse(n.GetScalarValue(), NumberStyles.Float, CultureInfo.InvariantCulture);
+                    o.Minimum = decimal.Parse(n.GetScalarValue(), NumberStyles.Any, CultureInfo.InvariantCulture);
                 }
             },
             {
diff --git a/src/Microsoft.OpenApi.Readers/V3/OpenApiSchemaDeserializer.cs b/src/Microsoft.OpenApi.Readers/V3/OpenApiSchemaDeserializer.cs
@@ -27,13 +27,13 @@ internal static partial class OpenApiV3Deserializer
             {
                 "multipleOf", (o, n) =>
                 {
-                    o.MultipleOf = decimal.Parse(n.GetScalarValue(), NumberStyles.Float, CultureInfo.InvariantCulture); 
+                    o.MultipleOf = decimal.Parse(n.GetScalarValue(), NumberStyles.Any, CultureInfo.InvariantCulture); 
                 }
             },
             {
                 "maximum", (o, n) =>
                 {
-                    o.Maximum = decimal.Parse(n.GetScalarValue(), NumberStyles.Float, CultureInfo.InvariantCulture);
+                    o.Maximum = decimal.Parse(n.GetScalarValue(), NumberStyles.Any, CultureInfo.InvariantCulture);
                 }
             },
             {
@@ -45,7 +45,7 @@ internal static partial class OpenApiV3Deserializer
             {
                 "minimum", (o, n) =>
                 {
-                    o.Minimum = decimal.Parse(n.GetScalarValue(), NumberStyles.Float, CultureInfo.InvariantCulture);
+                    o.Minimum = decimal.Parse(n.GetScalarValue(), NumberStyles.Any, CultureInfo.InvariantCulture);
                 }
             },
             {

Original file line number	Diff line number	Diff line change
`@@ -26,13 +26,13 @@ internal static partial class OpenApiV2Deserializer`
`26`	`26`	`{`
`27`	`27`	`"multipleOf", (o, n) =>`
`28`	`28`	`{`
`29`		`- o.MultipleOf = decimal.Parse(n.GetScalarValue(), NumberStyles.Float, CultureInfo.InvariantCulture);`
	`29`	`+ o.MultipleOf = decimal.Parse(n.GetScalarValue(), NumberStyles.Any, CultureInfo.InvariantCulture);`
`30`	`30`	`}`
`31`	`31`	`},`
`32`	`32`	`{`
`33`	`33`	`"maximum", (o, n) =>`
`34`	`34`	`{`
`35`		`- o.Maximum = decimal.Parse(n.GetScalarValue(), NumberStyles.Float, CultureInfo.InvariantCulture);`
	`35`	`+ o.Maximum = decimal.Parse(n.GetScalarValue(), NumberStyles.Any, CultureInfo.InvariantCulture);`
`36`	`36`	`}`
`37`	`37`	`},`
`38`	`38`	`{`
`@@ -44,7 +44,7 @@ internal static partial class OpenApiV2Deserializer`
`44`	`44`	`{`
`45`	`45`	`"minimum", (o, n) =>`
`46`	`46`	`{`
`47`		`- o.Minimum = decimal.Parse(n.GetScalarValue(), NumberStyles.Float, CultureInfo.InvariantCulture);`
	`47`	`+ o.Minimum = decimal.Parse(n.GetScalarValue(), NumberStyles.Any, CultureInfo.InvariantCulture);`
`48`	`48`	`}`
`49`	`49`	`},`
`50`	`50`	`{`
Original file line number	Diff line number	Diff line change
`@@ -27,13 +27,13 @@ internal static partial class OpenApiV3Deserializer`
`27`	`27`	`{`
`28`	`28`	`"multipleOf", (o, n) =>`
`29`	`29`	`{`
`30`		`- o.MultipleOf = decimal.Parse(n.GetScalarValue(), NumberStyles.Float, CultureInfo.InvariantCulture);`
	`30`	`+ o.MultipleOf = decimal.Parse(n.GetScalarValue(), NumberStyles.Any, CultureInfo.InvariantCulture);`
`31`	`31`	`}`
`32`	`32`	`},`
`33`	`33`	`{`
`34`	`34`	`"maximum", (o, n) =>`
`35`	`35`	`{`
`36`		`- o.Maximum = decimal.Parse(n.GetScalarValue(), NumberStyles.Float, CultureInfo.InvariantCulture);`
	`36`	`+ o.Maximum = decimal.Parse(n.GetScalarValue(), NumberStyles.Any, CultureInfo.InvariantCulture);`
`37`	`37`	`}`
`38`	`38`	`},`
`39`	`39`	`{`
`@@ -45,7 +45,7 @@ internal static partial class OpenApiV3Deserializer`
`45`	`45`	`{`
`46`	`46`	`"minimum", (o, n) =>`
`47`	`47`	`{`
`48`		`- o.Minimum = decimal.Parse(n.GetScalarValue(), NumberStyles.Float, CultureInfo.InvariantCulture);`
	`48`	`+ o.Minimum = decimal.Parse(n.GetScalarValue(), NumberStyles.Any, CultureInfo.InvariantCulture);`
`49`	`49`	`}`
`50`	`50`	`},`
`51`	`51`	`{`